63 files changed, 357 insertions, 106 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f81d56e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,169 @@
+# Based on https://raw.githubusercontent.com/github/gitignore/main/Node.gitignore
+
+# Logs
+
+logs
+_.log
+npm-debug.log_
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+
+report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
+
+# Runtime data
+
+pids
+_.pid
+_.seed
+\*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+
+lib-cov
+
+# Coverage directory used by tools like istanbul
+
+coverage
+\*.lcov
+
+# nyc test coverage
+
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+
+bower_components
+
+# node-waf configuration
+
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+
+build/Release
+
+# Dependency directories
+
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+
+web_modules/
+
+# TypeScript cache
+
+\*.tsbuildinfo
+
+# Optional npm cache directory
+
+.npm
+
+# Optional eslint cache
+
+.eslintcache
+
+# Optional stylelint cache
+
+.stylelintcache
+
+# Microbundle cache
+
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+
+.node_repl_history
+
+# Output of 'npm pack'
+
+\*.tgz
+
+# Yarn Integrity file
+
+.yarn-integrity
+
+# dotenv environment variable files
+
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+
+.cache
+.parcel-cache
+
+# Next.js build output
+
+.next
+out
+
+# Nuxt.js build / generate output
+
+.nuxt
+dist
+
+# Gatsby files
+
+.cache/
+
+# Comment in the public line in if your project uses Gatsby and not Next.js
+
+# https://nextjs.org/blog/next-9-1#public-directory-support
+
+# public
+
+# vuepress build output
+
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+
+.temp
+.cache
+
+# Docusaurus cache and generated files
+
+.docusaurus
+
+# Serverless directories
+
+.serverless/
+
+# FuseBox cache
+
+.fusebox/
+
+# DynamoDB Local files
+
+.dynamodb/
+
+# TernJS port file
+
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+
+.vscode-test
+
+# yarn v2
+
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.\*
diff --git a/client/lib/systems/WallBounds.ts b/client/lib/systems/WallBounds.ts
deleted file mode 100644
index 3fd5dc4..0000000
--- a/client/lib/systems/WallBounds.ts
+++ /dev/null
@@ -1,35 +0,0 @@
-import { System, SystemNames } from ".";
-import { BoundingBox, ComponentNames } from "../components";
-import type { Entity } from "../entities";
-
-export class WallBounds extends System {
-  private screenWidth: number;
-
-  constructor(screenWidth: number) {
-    super(SystemNames.WallBounds);
-
-    this.screenWidth = screenWidth;
-  }
-
-  public update(
-    _dt: number,
-    entityMap: Map<number, Entity>,
-    componentEntities: Map<string, Set<number>>
-  ) {
-    componentEntities.get(ComponentNames.WallBounded)?.forEach((entityId) => {
-      const entity = entityMap.get(entityId);
-      if (!entity.hasComponent(ComponentNames.BoundingBox)) {
-        return;
-      }
-
-      const boundingBox = entity.getComponent<BoundingBox>(
-        ComponentNames.BoundingBox
-      );
-
-      boundingBox.center.x = Math.min(
-        this.screenWidth - boundingBox.dimension.width / 2,
-        Math.max(boundingBox.dimension.width / 2, boundingBox.center.x)
-      );
-    });
-  }
-}
diff --git a/client/package-lock.json b/client/package-lock.json
index 641f566..bf627d9 100644
--- a/client/package-lock.json
+++ b/client/package-lock.json
@@ -7,6 +7,9 @@
     "": {
       "name": "client",
       "version": "0.0.0",
+      "dependencies": {
+        "module-alias": "^2.2.3"
+      },
       "devDependencies": {
         "@sveltejs/vite-plugin-svelte": "^2.0.4",
         "@tsconfig/svelte": "^4.0.1",
@@ -1585,6 +1588,11 @@
         "mkdirp": "bin/cmd.js"
       }
     },
+    "node_modules/module-alias": {
+      "version": "2.2.3",
+      "resolved": "https://registry.npmjs.org/module-alias/-/module-alias-2.2.3.tgz",
+      "integrity": "sha512-23g5BFj4zdQL/b6tor7Ji+QY4pEfNH784BMslY9Qb0UnJWRAt+lQGLYmRaM0KDBwIG23ffEBELhZDP2rhi9f/Q=="
+    },
     "node_modules/mri": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/mri/-/mri-1.2.0.tgz",
diff --git a/client/package.json b/client/package.json
index 1ddd2b8..43c1b66 100644
--- a/client/package.json
+++ b/client/package.json
@@ -20,5 +20,8 @@
     "tslib": "^2.5.0",
     "typescript": "^5.0.2",
     "vite": "^4.3.9"
+  },
+  "dependencies": {
+    "module-alias": "^2.2.3"
   }
 }
diff --git a/client/lib/JumpStorm.ts b/client/src/JumpStorm.ts
index c76d9bc..45ea163 100644
--- a/client/lib/JumpStorm.ts
+++ b/client/src/JumpStorm.ts
@@ -1,5 +1,5 @@
-import { Floor, Player } from "./entities";
-import { Game } from "./Game";
+import { Floor, Player } from "@engine/entities";
+import { Game } from "@engine/Game";
 import {
   WallBounds,
   FacingDirection,
@@ -7,7 +7,7 @@ import {
   Physics,
   Input,
   Collision,
-} from "./systems";
+} from "@engine/systems";
 
 export class JumpStorm {
   private game: Game;
diff --git a/client/src/components/GameCanvas.svelte b/client/src/components/GameCanvas.svelte
index 766a08a..d7abecf 100644
--- a/client/src/components/GameCanvas.svelte
+++ b/client/src/components/GameCanvas.svelte
@@ -1,11 +1,8 @@
 <script lang="ts">
   import { onMount } from "svelte";
-  import { Game } from "../../lib/Game";
-  import { Render } from "../../lib/systems";
-  import { Floor } from "../../lib/entities";
-  import { loadAssets } from "../../lib/config";
-  import { JumpStorm } from "../../lib/JumpStorm";
-
+  import { loadAssets } from "@engine/config";
+  import { JumpStorm} from "../Jumpstorm";
+  
   let canvas: HTMLCanvasElement;
   let ctx: CanvasRenderingContext2D;
 
diff --git a/client/src/components/LeaderBoard.svelte b/client/src/components/LeaderBoard.svelte
index d6e4ce3..880e64a 100644
--- a/client/src/components/LeaderBoard.svelte
+++ b/client/src/components/LeaderBoard.svelte
@@ -1,5 +1,5 @@
 <script lang="ts">
-  import { type LeaderBoardEntry } from "../../lib/interfaces";
+  import { type LeaderBoardEntry } from "@engine/interfaces";
   import LeaderBoardCard from "./LeaderBoardCard.svelte";
 
   const MAX_ENTRIES = 8;
diff --git a/client/src/components/LeaderBoardCard.svelte b/client/src/components/LeaderBoardCard.svelte
index 446d734..f46c000 100644
--- a/client/src/components/LeaderBoardCard.svelte
+++ b/client/src/components/LeaderBoardCard.svelte
@@ -1,5 +1,5 @@
 <script lang="ts">
-  import { type LeaderBoardEntry } from "../../lib/interfaces";
+  import { type LeaderBoardEntry } from "@engine/interfaces";
 
   export let entry: LeaderBoardEntry = {
     name: "simponic",
diff --git a/client/tsconfig.json b/client/tsconfig.json
index eabe862..781d1b3 100644
--- a/client/tsconfig.json
+++ b/client/tsconfig.json
@@ -24,5 +24,8 @@
     "src/**/*.js",
     "src/**/*.svelte"
   ],
+  "paths": {
+    "@engine/*": ["../engine/*"]
+  },
   "references": [{ "path": "./tsconfig.node.json" }]
 }
diff --git a/client/vite.config.ts b/client/vite.config.ts
index d701969..0307338 100644
--- a/client/vite.config.ts
+++ b/client/vite.config.ts
@@ -1,7 +1,13 @@
-import { defineConfig } from 'vite'
-import { svelte } from '@sveltejs/vite-plugin-svelte'
+import { defineConfig } from "vite";
+import { svelte } from "@sveltejs/vite-plugin-svelte";
+import { fileURLToPath, URL } from "node:url";
 
 // https://vitejs.dev/config/
 export default defineConfig({
   plugins: [svelte()],
-})
+  resolve: {
+    alias: {
+      "@engine": fileURLToPath(new URL("../engine", import.meta.url)),
+    },
+  },
+});
diff --git a/client/lib/Game.ts b/engine/Game.ts
index d6ffb47..c2a2c4f 100644
--- a/client/lib/Game.ts
+++ b/engine/Game.ts
@@ -2,18 +2,21 @@ import { Entity } from "./entities";
 import { System } from "./systems";
 
 export class Game {
-  private entities: Map<number, Entity>;
-  private systems: Map<string, System>;
   private systemOrder: string[];
 
   private running: boolean;
   private lastTimeStamp: number;
 
+  public entities: Map<number, Entity>;
+  public systems: Map<string, System>;
+  public componentEntities: Map<string, Set<number>>;
+
   constructor() {
     this.running = false;
     this.systemOrder = [];
     this.systems = new Map();
     this.entities = new Map();
+    this.componentEntities = new Map();
   }
 
   public start() {
@@ -52,19 +55,22 @@ export class Game {
     const dt = timeStamp - this.lastTimeStamp;
     this.lastTimeStamp = timeStamp;
 
-    const componentEntities = new Map<string, Set<number>>();
+    this.componentEntities.clear();
     this.entities.forEach((entity) =>
       entity.getComponents().forEach((component) => {
-        if (!componentEntities.has(component.name)) {
-          componentEntities.set(component.name, new Set<number>([entity.id]));
+        if (!this.componentEntities.has(component.name)) {
+          this.componentEntities.set(
+            component.name,
+            new Set<number>([entity.id])
+          );
           return;
         }
-        componentEntities.get(component.name).add(entity.id);
+        this.componentEntities.get(component.name).add(entity.id);
       })
     );
 
     this.systemOrder.forEach((systemName) => {
-      this.systems.get(systemName).update(dt, this.entities, componentEntities);
+      this.systems.get(systemName).update(dt, this);
     });
   };
 }
diff --git a/client/lib/components/BoundingBox.ts b/engine/components/BoundingBox.ts
index 2b1d648..2b1d648 100644
--- a/client/lib/components/BoundingBox.ts
+++ b/engine/components/BoundingBox.ts
diff --git a/client/lib/components/Collide.ts b/engine/components/Collide.ts
index 889ecf8..889ecf8 100644
--- a/client/lib/components/Collide.ts
+++ b/engine/components/Collide.ts
diff --git a/client/lib/components/Component.ts b/engine/components/Component.ts
index 7331982..7331982 100644
--- a/client/lib/components/Component.ts
+++ b/engine/components/Component.ts
diff --git a/client/lib/components/Control.ts b/engine/components/Control.ts
index 094ef1c..094ef1c 100644
--- a/client/lib/components/Control.ts
+++ b/engine/components/Control.ts
diff --git a/client/lib/components/FacingDirection.ts b/engine/components/FacingDirection.ts
index 1c701a3..1c701a3 100644
--- a/client/lib/components/FacingDirection.ts
+++ b/engine/components/FacingDirection.ts
diff --git a/client/lib/components/Forces.ts b/engine/components/Forces.ts
index bf540a1..bf540a1 100644
--- a/client/lib/components/Forces.ts
+++ b/engine/components/Forces.ts
diff --git a/client/lib/components/Gravity.ts b/engine/components/Gravity.ts
index 89fcb67..89fcb67 100644
--- a/client/lib/components/Gravity.ts
+++ b/engine/components/Gravity.ts
diff --git a/client/lib/components/Jump.ts b/engine/components/Jump.ts
index 0b40767..0b40767 100644
--- a/client/lib/components/Jump.ts
+++ b/engine/components/Jump.ts
diff --git a/client/lib/components/Mass.ts b/engine/components/Mass.ts
index daa2d71..daa2d71 100644
--- a/client/lib/components/Mass.ts
+++ b/engine/components/Mass.ts
diff --git a/client/lib/components/Moment.ts b/engine/components/Moment.ts
index 3d0dd2f..3d0dd2f 100644
--- a/client/lib/components/Moment.ts
+++ b/engine/components/Moment.ts
diff --git a/client/lib/components/Sprite.ts b/engine/components/Sprite.ts
index 90e1389..90e1389 100644
--- a/client/lib/components/Sprite.ts
+++ b/engine/components/Sprite.ts
diff --git a/client/lib/components/TopCollidable.ts b/engine/components/TopCollidable.ts
index 7fb147d..7fb147d 100644
--- a/client/lib/components/TopCollidable.ts
+++ b/engine/components/TopCollidable.ts
diff --git a/client/lib/components/Velocity.ts b/engine/components/Velocity.ts
index 119427d..119427d 100644
--- a/client/lib/components/Velocity.ts
+++ b/engine/components/Velocity.ts
diff --git a/client/lib/components/WallBounded.ts b/engine/components/WallBounded.ts
index 5f787e1..5f787e1 100644
--- a/client/lib/components/WallBounded.ts
+++ b/engine/components/WallBounded.ts
diff --git a/client/lib/components/index.ts b/engine/components/index.ts
index 67f1259..67f1259 100644
--- a/client/lib/components/index.ts
+++ b/engine/components/index.ts
diff --git a/client/lib/components/names.ts b/engine/components/names.ts
index e2ee3d3..e2ee3d3 100644
--- a/client/lib/components/names.ts
+++ b/engine/components/names.ts
diff --git a/client/lib/config/assets.ts b/engine/config/assets.ts
index 51a5303..51a5303 100644
--- a/client/lib/config/assets.ts
+++ b/engine/config/assets.ts
diff --git a/client/lib/config/constants.ts b/engine/config/constants.ts
index 27c8160..27c8160 100644
--- a/client/lib/config/constants.ts
+++ b/engine/config/constants.ts
diff --git a/client/lib/config/index.ts b/engine/config/index.ts
index 7a1052a..7a1052a 100644
--- a/client/lib/config/index.ts
+++ b/engine/config/index.ts
diff --git a/client/lib/config/sprites.ts b/engine/config/sprites.ts
index 18bec73..18bec73 100644
--- a/client/lib/config/sprites.ts
+++ b/engine/config/sprites.ts
diff --git a/client/lib/entities/Entity.ts b/engine/entities/Entity.ts
index e57ccde..e57ccde 100644
--- a/client/lib/entities/Entity.ts
+++ b/engine/entities/Entity.ts
diff --git a/client/lib/entities/Floor.ts b/engine/entities/Floor.ts
index d51badc..d51badc 100644
--- a/client/lib/entities/Floor.ts
+++ b/engine/entities/Floor.ts
diff --git a/client/lib/entities/Player.ts b/engine/entities/Player.ts
index 0ba5a41..0ba5a41 100644
--- a/client/lib/entities/Player.ts
+++ b/engine/entities/Player.ts
diff --git a/client/lib/entities/index.ts b/engine/entities/index.ts
index a921512..a921512 100644
--- a/client/lib/entities/index.ts
+++ b/engine/entities/index.ts
diff --git a/client/lib/interfaces/Action.ts b/engine/interfaces/Action.ts
index 61c89e1..61c89e1 100644
--- a/client/lib/interfaces/Action.ts
+++ b/engine/interfaces/Action.ts
diff --git a/client/lib/interfaces/Direction.ts b/engine/interfaces/Direction.ts
index 0bc6ef3..0bc6ef3 100644
--- a/client/lib/interfaces/Direction.ts
+++ b/engine/interfaces/Direction.ts
diff --git a/client/lib/interfaces/Draw.ts b/engine/interfaces/Draw.ts
index 6561a01..6561a01 100644
--- a/client/lib/interfaces/Draw.ts
+++ b/engine/interfaces/Draw.ts
diff --git a/client/lib/interfaces/LeaderBoardEntry.ts b/engine/interfaces/LeaderBoardEntry.ts
index 1b1e7b3..1b1e7b3 100644
--- a/client/lib/interfaces/LeaderBoardEntry.ts
+++ b/engine/interfaces/LeaderBoardEntry.ts
diff --git a/client/lib/interfaces/Vec2.ts b/engine/interfaces/Vec2.ts
index b2bae37..b2bae37 100644
--- a/client/lib/interfaces/Vec2.ts
+++ b/engine/interfaces/Vec2.ts
diff --git a/client/lib/interfaces/index.ts b/engine/interfaces/index.ts
index 0398abd..0398abd 100644
--- a/client/lib/interfaces/index.ts
+++ b/engine/interfaces/index.ts
diff --git a/client/lib/structures/QuadTree.ts b/engine/structures/QuadTree.ts
index 7913e59..7913e59 100644
--- a/client/lib/structures/QuadTree.ts
+++ b/engine/structures/QuadTree.ts
diff --git a/client/lib/structures/index.ts b/engine/structures/index.ts
index 605a82a..605a82a 100644
--- a/client/lib/structures/index.ts
+++ b/engine/structures/index.ts
diff --git a/client/lib/systems/Collision.ts b/engine/systems/Collision.ts
index 16ad8c6..4fcb906 100644
--- a/client/lib/systems/Collision.ts
+++ b/engine/systems/Collision.ts
@@ -7,13 +7,14 @@ import {
   Velocity,
   Moment,
 } from "../components";
+import { Game } from "../Game";
 import { PhysicsConstants } from "../config";
 import { Entity } from "../entities";
 import type { Dimension2D } from "../interfaces";
 import { QuadTree } from "../structures";
 
 export class Collision extends System {
-  private static readonly COLLIDABLE_COMPONENTS = [
+  private static readonly COLLIDABLE_COMPONENT_NAMES = [
     ComponentNames.Collide,
     ComponentNames.TopCollidable,
   ];
@@ -33,19 +34,17 @@ export class Collision extends System {
     );
   }
 
-  public update(
-    dt: number,
-    entityMap: Map<number, Entity>,
-    entityComponents: Map<string, Set<number>>
-  ) {
+  public update(dt: number, game: Game) {
+    // rebuild the quadtree
     this.quadTree.clear();
 
     const entitiesToAddToQuadtree: Entity[] = [];
-    Collision.COLLIDABLE_COMPONENTS.map((componentName) =>
-      entityComponents.get(componentName)
+
+    Collision.COLLIDABLE_COMPONENT_NAMES.map((componentName) =>
+      game.componentEntities.get(componentName)
     ).forEach((entityIds: Set<number>) =>
       entityIds.forEach((id) => {
-        const entity = entityMap.get(id);
+        const entity = game.entities.get(id);
         if (!entity.hasComponent(ComponentNames.BoundingBox)) {
           return;
         }
@@ -65,13 +64,15 @@ export class Collision extends System {
       );
     });
 
+    // find colliding entities and perform collisions
     const collidingEntities = this.getCollidingEntities(
       entitiesToAddToQuadtree,
-      entityMap
+      game.entities
     );
+
     collidingEntities.forEach(([entityAId, entityBId]) => {
       const [entityA, entityB] = [entityAId, entityBId].map((id) =>
-        entityMap.get(id)
+        game.entities.get(id)
       );
       this.performCollision(entityA, entityB);
     });
@@ -92,7 +93,7 @@ export class Collision extends System {
       entityB.hasComponent(ComponentNames.TopCollidable) &&
       entityABoundingBox.center.y <= entityBBoundingBox.center.y &&
       velocity &&
-      velocity.dCartesian.dy >= 0 // don't apply floor logic when coming through the bottom
+      velocity.dCartesian.dy >= 0 // don't apply "floor" logic when coming through the bottom
     ) {
       if (entityBBoundingBox.rotation != 0) {
         throw new Error(
@@ -157,11 +158,11 @@ export class Collision extends System {
     return collidingEntityIds;
   }
 
+  // ramblings: https://excalidraw.com/#json=z-xD86Za4a3duZuV2Oky0,KaGe-5iHJu1Si8inEo4GLQ
   private getDyToPushOutOfFloor(
     entityBoundingBox: BoundingBox,
     floorBoundingBox: BoundingBox
   ): number {
-    // ramblings: https://excalidraw.com/#json=z-xD86Za4a3duZuV2Oky0,KaGe-5iHJu1Si8inEo4GLQ
     const {
       rotation,
       center: { x, y },
diff --git a/client/lib/systems/FacingDirection.ts b/engine/systems/FacingDirection.ts
index fbb4c7c..c6513ac 100644
--- a/client/lib/systems/FacingDirection.ts
+++ b/engine/systems/FacingDirection.ts
@@ -3,6 +3,7 @@ import {
   Velocity,
   FacingDirection as FacingDirectionComponent,
 } from "../components";
+import { Game } from "../Game";
 import type { Entity } from "../entities";
 import { System, SystemNames } from "./";
 
@@ -11,15 +12,11 @@ export class FacingDirection extends System {
     super(SystemNames.FacingDirection);
   }
 
-  public update(
-    _dt: number,
-    entityMap: Map<number, Entity>,
-    componentEntities: Map<string, Set<number>>
-  ) {
-    componentEntities
+  public update(_dt: number, game: Game) {
+    game.componentEntities
       .get(ComponentNames.FacingDirection)
       ?.forEach((entityId) => {
-        const entity = entityMap.get(entityId);
+        const entity = game.entities.get(entityId);
         if (!entity.hasComponent(ComponentNames.Velocity)) {
           return;
         }
diff --git a/client/lib/systems/Input.ts b/engine/systems/Input.ts
index 92932dd..9a92163 100644
--- a/client/lib/systems/Input.ts
+++ b/engine/systems/Input.ts
@@ -6,6 +6,7 @@ import {
   Velocity,
   Mass,
 } from "../components";
+import { Game } from "../Game";
 import { KeyConstants, PhysicsConstants } from "../config";
 import type { Entity } from "../entities";
 import { Action } from "../interfaces";
@@ -34,13 +35,9 @@ export class Input extends System {
     return keys.some((key) => this.keys.has(key));
   }
 
-  public update(
-    dt: number,
-    entityMap: Map<number, Entity>,
-    componentEntities: Map<string, Set<number>>
-  ) {
-    componentEntities.get(ComponentNames.Control)?.forEach((entityId) => {
-      const entity = entityMap.get(entityId);
+  public update(dt: number, game: Game) {
+    game.componentEntities.get(ComponentNames.Control)?.forEach((entityId) => {
+      const entity = game.entities.get(entityId);
       if (!entity.hasComponent(ComponentNames.Velocity)) {
         return;
       }
@@ -58,8 +55,8 @@ export class Input extends System {
       }
     });
 
-    componentEntities.get(ComponentNames.Jump)?.forEach((entityId) => {
-      const entity = entityMap.get(entityId);
+    game.componentEntities.get(ComponentNames.Jump)?.forEach((entityId) => {
+      const entity = game.entities.get(entityId);
       const jump = entity.getComponent<Jump>(ComponentNames.Jump);
       const velocity = entity.getComponent<Velocity>(ComponentNames.Velocity);
 
diff --git a/client/lib/systems/Physics.ts b/engine/systems/Physics.ts
index 319ae29..7edeb41 100644
--- a/client/lib/systems/Physics.ts
+++ b/engine/systems/Physics.ts
@@ -12,19 +12,16 @@ import {
 import { PhysicsConstants } from "../config";
 import type { Entity } from "../entities";
 import type { Force2D } from "../interfaces";
+import { Game } from "../Game";
 
 export class Physics extends System {
   constructor() {
     super(SystemNames.Physics);
   }
 
-  public update(
-    dt: number,
-    entityMap: Map<number, Entity>,
-    componentEntities: Map<string, Set<number>>
-  ): void {
-    componentEntities.get(ComponentNames.Forces)?.forEach((entityId) => {
-      const entity = entityMap.get(entityId);
+  public update(dt: number, game: Game): void {
+    game.componentEntities.get(ComponentNames.Forces)?.forEach((entityId) => {
+      const entity = game.entities.get(entityId);
 
       const mass = entity.getComponent<Mass>(ComponentNames.Mass).mass;
       const forces = entity.getComponent<Forces>(ComponentNames.Forces).forces;
@@ -74,8 +71,8 @@ export class Physics extends System {
       }
     });
 
-    componentEntities.get(ComponentNames.Velocity)?.forEach((entityId) => {
-      const entity = entityMap.get(entityId);
+    game.componentEntities.get(ComponentNames.Velocity)?.forEach((entityId) => {
+      const entity = game.entities.get(entityId);
       const velocity = entity.getComponent<Velocity>(ComponentNames.Velocity);
       const boundingBox = entity.getComponent<BoundingBox>(
         ComponentNames.BoundingBox
diff --git a/client/lib/systems/Render.ts b/engine/systems/Render.ts
index 0c76b00..b5479e1 100644
--- a/client/lib/systems/Render.ts
+++ b/engine/systems/Render.ts
@@ -1,7 +1,9 @@
 import { System, SystemNames } from ".";
 import { BoundingBox, ComponentNames, Sprite } from "../components";
 import type { Entity } from "../entities";
+import { Game } from "../Game";
 import type { DrawArgs } from "../interfaces";
+import { clamp } from "../utils";
 
 export class Render extends System {
   private ctx: CanvasRenderingContext2D;
@@ -11,15 +13,11 @@ export class Render extends System {
     this.ctx = ctx;
   }
 
-  public update(
-    dt: number,
-    entityMap: Map<number, Entity>,
-    componentEntities: Map<string, Set<number>>
-  ) {
+  public update(dt: number, game: Game) {
     this.ctx.clearRect(0, 0, this.ctx.canvas.width, this.ctx.canvas.height);
 
-    componentEntities.get(ComponentNames.Sprite)?.forEach((entityId) => {
-      const entity = entityMap.get(entityId);
+    game.componentEntities.get(ComponentNames.Sprite)?.forEach((entityId) => {
+      const entity = game.entities.get(entityId);
       const sprite = entity.getComponent<Sprite>(ComponentNames.Sprite);
       sprite.update(dt);
 
@@ -29,6 +27,22 @@ export class Render extends System {
           ComponentNames.BoundingBox
         );
 
+        // don't render if we're outside the screen
+        if (
+          clamp(
+            boundingBox.center.y,
+            -boundingBox.dimension.height / 2,
+            this.ctx.canvas.height + boundingBox.dimension.height / 2
+          ) != boundingBox.center.y ||
+          clamp(
+            boundingBox.center.x,
+            -boundingBox.dimension.width / 2,
+            this.ctx.canvas.width + boundingBox.dimension.width / 2
+          ) != boundingBox.center.x
+        ) {
+          return;
+        }
+
         drawArgs = {
           center: boundingBox.center,
           dimension: boundingBox.dimension,
diff --git a/client/lib/systems/System.ts b/engine/systems/System.ts
index 2accc97..1aad285 100644
--- a/client/lib/systems/System.ts
+++ b/engine/systems/System.ts
@@ -1,4 +1,5 @@
 import { Entity } from "../entities";
+import { Game } from "../Game";
 
 export abstract class System {
   public readonly name: string;
@@ -7,9 +8,5 @@ export abstract class System {
     this.name = name;
   }
 
-  abstract update(
-    dt: number,
-    entityMap: Map<number, Entity>,
-    componentEntities: Map<string, Set<number>>
-  ): void;
+  abstract update(dt: number, game: Game): void;
 }
diff --git a/engine/systems/WallBounds.ts b/engine/systems/WallBounds.ts
new file mode 100644
index 0000000..6ea2267
--- /dev/null
+++ b/engine/systems/WallBounds.ts
@@ -0,0 +1,36 @@
+import { System, SystemNames } from ".";
+import { BoundingBox, ComponentNames } from "../components";
+import { Game } from "../Game";
+import type { Entity } from "../entities";
+import { clamp } from "../utils";
+
+export class WallBounds extends System {
+  private screenWidth: number;
+
+  constructor(screenWidth: number) {
+    super(SystemNames.WallBounds);
+
+    this.screenWidth = screenWidth;
+  }
+
+  public update(_dt: number, game: Game) {
+    game.componentEntities
+      .get(ComponentNames.WallBounded)
+      ?.forEach((entityId) => {
+        const entity = game.entities.get(entityId);
+        if (!entity.hasComponent(ComponentNames.BoundingBox)) {
+          return;
+        }
+
+        const boundingBox = entity.getComponent<BoundingBox>(
+          ComponentNames.BoundingBox
+        );
+
+        boundingBox.center.x = clamp(
+          boundingBox.center.x,
+          boundingBox.dimension.width / 2,
+          this.screenWidth - boundingBox.dimension.width / 2
+        );
+      });
+  }
+}
diff --git a/client/lib/systems/index.ts b/engine/systems/index.ts
index 6cb6f35..6cb6f35 100644
--- a/client/lib/systems/index.ts
+++ b/engine/systems/index.ts
diff --git a/client/lib/systems/names.ts b/engine/systems/names.ts
index 23f31fc..23f31fc 100644
--- a/client/lib/systems/names.ts
+++ b/engine/systems/names.ts
diff --git a/engine/utils/clamp.ts b/engine/utils/clamp.ts
new file mode 100644
index 0000000..42e1764
--- /dev/null
+++ b/engine/utils/clamp.ts
@@ -0,0 +1,2 @@
+export const clamp = (num: number, min: number, max: number) =>
+  Math.min(Math.max(num, min), max);
diff --git a/client/lib/utils/dotProduct.ts b/engine/utils/dotProduct.ts
index 59f8857..59f8857 100644
--- a/client/lib/utils/dotProduct.ts
+++ b/engine/utils/dotProduct.ts
diff --git a/client/lib/utils/index.ts b/engine/utils/index.ts
index 1f8e2f0..4e465c2 100644
--- a/client/lib/utils/index.ts
+++ b/engine/utils/index.ts
@@ -1,3 +1,4 @@
 export * from "./rotateVector";
 export * from "./normalizeVector";
 export * from "./dotProduct";
+export * from "./clamp";
diff --git a/client/lib/utils/normalizeVector.ts b/engine/utils/normalizeVector.ts
index e6dfd7f..e6dfd7f 100644
--- a/client/lib/utils/normalizeVector.ts
+++ b/engine/utils/normalizeVector.ts
diff --git a/client/lib/utils/rotateVector.ts b/engine/utils/rotateVector.ts
index 82bb54d..82bb54d 100644
--- a/client/lib/utils/rotateVector.ts
+++ b/engine/utils/rotateVector.ts
diff --git a/server/README.md b/server/README.md
new file mode 100644
index 0000000..84286d5
--- /dev/null
+++ b/server/README.md
@@ -0,0 +1,15 @@
+# server
+
+To install dependencies:
+
+```bash
+bun install
+```
+
+To run:
+
+```bash
+bun run index.ts
+```
+
+This project was created using `bun init` in bun v0.6.14. [Bun](https://bun.sh) is a fast all-in-one JavaScript runtime.
diff --git a/server/bun.lockb b/server/bun.lockb
new file mode 100755
index 0000000..7f8b5ce
--- /dev/null
+++ b/server/bun.lockb
diff --git a/server/index.ts b/server/index.ts
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/server/index.ts
diff --git a/server/package.json b/server/package.json
new file mode 100644
index 0000000..0bb97a9
--- /dev/null
+++ b/server/package.json
@@ -0,0 +1,13 @@
+{
+  "name": "server",
+  "module": "src/index.ts",
+  "type": "module",
+  "devDependencies": {
+    "bun-types": "^0.6.14"
+  },
+  "peerDependencies": {
+    "typescript": "^5.0.0"
+  },
+  "dependencies": {
+  }
+}
diff --git a/server/src/index.ts b/server/src/index.ts
new file mode 100644
index 0000000..138762b
--- /dev/null
+++ b/server/src/index.ts
@@ -0,0 +1,3 @@
+import { Game } from "../../engine/Game";
+
+console.log(Game);
diff --git a/server/tsconfig.json b/server/tsconfig.json
new file mode 100644
index 0000000..29f8aa0
--- /dev/null
+++ b/server/tsconfig.json
@@ -0,0 +1,21 @@
+{
+  "compilerOptions": {
+    "lib": ["ESNext"],
+    "module": "esnext",
+    "target": "esnext",
+    "moduleResolution": "bundler",
+    "moduleDetection": "force",
+    "allowImportingTsExtensions": true,
+    "strict": true,
+    "downlevelIteration": true,
+    "skipLibCheck": true,
+    "jsx": "preserve",
+    "allowSyntheticDefaultImports": true,
+    "forceConsistentCasingInFileNames": true,
+    "allowJs": true,
+    "noEmit": true,
+    "types": [
+      "bun-types" // add Bun global
+    ]
+  }
+}