Some work

src/box.js

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+const MAX_SPEED = 20;
+const MAX_JUMP = 2;
+const G = 500;
+
+class Box {
+    constructor() {
+        this.position = 0;
+        this.speed = 0;
+        this.size = 100;
+        this.jumpCounter = MAX_JUMP;
+    }
+
+    drawOn(canvas) {
+        let ctx = canvas.getContext('2d');
+
+        ctx.fillStyle = 'rgb(0, 0, 0)';
+        ctx.beginPath();
+        ctx.rect(
+            canvas.width / 2.0 - this.size / 2.0,
+            canvas.height - this.size - this.position,
+            this.size,
+            this.size
+        );
+
+        ctx.fill();
+
+    }
+
+    update(time = 0.002) {
+        this.speed -= G * time;
+        this.speed = Math.max(this.speed, -MAX_SPEED);
+        this.position += this.speed;
+
+        if (this.position <= 0) {
+            this.position = 0;
+            this.speed = 0;
+            this.jumpCounter = MAX_JUMP;
+        }
+
+    }
+
+    jump() {
+        if (this.jumpCounter > 0) {
+            this.jumpCounter--;
+            this.speed = MAX_SPEED;
+        }
+    }
+}

src/close.js

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+})();

src/main.js

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+let canvas, ctx, box;
+
+init();
+render();
+
+function init() {
+    // Initialize canvas
+    canvas = document.getElementById('canvas');
+    document.body.style.margin = '0px';
+    onWindowResize();
+    ctx = canvas.getContext('2d');
+
+    // Initialize listeners
+    window.addEventListener('resize', onWindowResize);
+    document.addEventListener('touchstart', () => box.jump());
+
+    // Initialize game
+    box = new Box();
+}
+
+function render() {
+    // Manage physics
+    box.update();
+
+    // Do rendering
+    // canvas.width = canvas.width
+    ctx.clearRect(0, 0, canvas.width, canvas.height);
+    ctx.beginPath();
+    ctx.fillStyle = 'rgb(255, 0, 0)';
+    ctx.rect(0, 0, canvas.width, canvas.height);
+    ctx.fill();
+
+    box.drawOn(canvas);
+    requestAnimationFrame(render);
+}
+
+function onWindowResize() {
+    canvas.width = window.innerWidth;
+    canvas.height = window.innerHeight;
+}

src/object.js

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+class Object {
+
+}

src/open.js

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+"use strict";
+(function() {