===================================================================
--- original.js
+++ change.js
@@ -1,39 +1,68 @@
+var STAGE_WIDTH = 2048;
+var STAGE_HEIGHT = 2732;
 var NUM_COLUMNS = 16;
-var COLUMN_WIDTH = 2048 / NUM_COLUMNS;
-var TNTBox = Container.expand(function () {
+var COLUMN_WIDTH = STAGE_WIDTH / NUM_COLUMNS;
+var PLAYER_SIZE = 0.8 * COLUMN_WIDTH;
+var SPAWN_CONST = 30;
+var SPAWN_VARIANCE = 250;
+var SPAWN_TNT_CHANCE = 0.1;
+var BOX_SPEED = 5;
+var BOX_GRAVITY = 0.1;
+var FLOOR_OFFSET = 100;
+var Box = Container.expand(function (parent, x, y) {
 	var self = Container.call(this);
+	parent.addChild(self);
+	self.x = x;
+	self.y = y;
+	;
+	var speed = BOX_SPEED;
+	var boxGraphics = self.createAsset('box', 'Falling box', .5, .5);
+	var hitboxGraphics = self.createAsset('hitbox', 'Box hitbox', .5, .5);
+	hitboxGraphics.alpha = 0.1;
+	;
+	self.hitbox = hitboxGraphics;
+	self.update = update;
+	;
+	function update() {
+		speed += BOX_GRAVITY;
+		self.y += speed;
+	}
+});
+var TntBox = Container.expand(function (parent, x, y) {
+	var self = Container.call(this);
+	parent.addChild(self);
+	self.x = x;
+	self.y = y;
+	;
+	var speed = BOX_SPEED;
 	var tntGraphics = self.createAsset('tnt', 'TNT box', .5, .5);
 	var hitboxGraphics = self.createAsset('hitbox', 'TNT hitbox', .5, .5);
+	hitboxGraphics.alpha = 0.1;
+	;
 	self.hitbox = hitboxGraphics;
-	self.gravity = 0.1;
-	self.speed = 5;
-	self.move = function () {
-		self.speed += self.gravity;
-		self.y += self.speed;
-	};
+	self.update = update;
+	;
+	function update() {
+		speed += BOX_GRAVITY;
+		self.y += speed;
+	}
 });
-var Floor = Container.expand(function () {
+var Floor = Container.expand(function (parent, x, y) {
 	var self = Container.call(this);
-	var floorGraphics = self.createAsset('floor', 'Floor image', 0, 1);
-	floorGraphics.width = 2048;
-	self.addChild(floorGraphics);
+	parent.addChild(self);
+	self.x = x;
+	self.y = y;
+	;
+	var floorGraphics = self.createAsset('floor', 'Floor image', 0.5, 1);
+	floorGraphics.width = STAGE_WIDTH;
 });
-var Box = Container.expand(function () {
+var Player = Container.expand(function (parent, x, y) {
 	var self = Container.call(this);
-	var boxGraphics = self.createAsset('box', 'Falling box', .5, .5);
-	var hitboxGraphics = self.createAsset('hitbox', 'Box hitbox', .5, .5);
-	self.hitbox = hitboxGraphics;
-	self.gravity = 0.1;
-	self.speed = 5;
-	self.move = function () {
-		self.speed += self.gravity;
-		self.y += self.speed;
-	};
-});
-var Player = Container.expand(function (floorInstance) {
-	var self = Container.call(this);
-	self.floor = floorInstance;
+	parent.addChild(self);
+	self.x = x;
+	self.y = y;
+	;
 	var playerGraphics = self.createAsset('player', 'Player character', .5, .5);
 	self.isJumping = false;
 	self.jumpHeight = 150;
 	self.jumpSpeed = -15;
@@ -54,55 +83,73 @@
 	self.update = function () {
 		if (self.isJumping) {
 			self.verticalSpeed += self.gravity;
 			self.y += self.verticalSpeed;
-			if (self.y > self.floor.y - self.height) {
-				self.y = self.floor.y - self.height;
+			if (self.y > FLOOR_OFFSET - self.height) {
+				self.y = FLOOR_OFFSET - self.height;
 				self.isJumping = false;
 				self.verticalSpeed = 0;
 			}
 		}
 	};
 });
-var Column = Container.expand(function () {
+var Column = Container.expand(function (parent, x, y) {
 	var self = Container.call(this);
-	self.countdown = Math.floor(Math.random() * 100) + 50;
-	self.width = COLUMN_WIDTH;
-	self.height = 2732;
-	var columnGraphics = self.createAsset('column', 'Column graphics', 0.5, 1);
-	columnGraphics.width = self.width;
-	columnGraphics.height = self.height;
-	self.addChild(columnGraphics);
-	self.update = function (boxes, tickOffset) {
+	parent.addChild(self);
+	self.x = x;
+	self.y = y;
+	;
+	var countdown = SPAWN_CONST + Math.floor(Math.random() * SPAWN_VARIANCE);
+	;
+	self.update = update;
+	;
+	function update(boxes) {
 		var newBox;
-		self.countdown--;
-		if (self.countdown <= 0) {
-			if (Math.random() < 0.01) {
-				newBox = new TNTBox();
+		countdown--;
+		if (countdown <= 0) {
+			if (Math.random() < SPAWN_TNT_CHANCE) {
+				newBox = new TntBox();
 			} else {
 				newBox = new Box();
 			}
-			newBox.x = self.x + COLUMN_WIDTH / 2;
+			newBox.x = self.x;
 			newBox.y = 0;
 			boxes.push(newBox);
 			self.parent.addChild(newBox);
 			self.countdown = Math.floor(Math.random() * 100) + 50;
 		}
-	};
+	}
 });
 var Game = Container.expand(function () {
 	var self = Container.call(this);
+	;
 	var lastTouchX = null;
-	stage.on('down', function (obj) {
+	var boxes = [];
+	var columns = [];
+	var floor = self.addChild(new Floor(self, STAGE_WIDTH / 2, STAGE_HEIGHT));
+	var player = self.addChild(new Player(self, STAGE_WIDTH / 2, STAGE_HEIGHT - FLOOR_OFFSET - PLAYER_SIZE / 2));
+	for (var i = 0; i < NUM_COLUMNS; i++) {
+		columns.push(new Column(self, (i + 0.5) * COLUMN_WIDTH, 0));
+	}
+	var scoreTxt = new Text2('0', {
+		size: 150,
+		fill: "#ffffff"
+	});
+	scoreTxt.anchor.set(.5, 0);
+	LK.gui.topCenter.addChild(scoreTxt);
+	var isGameOver = false;
+	var tickOffset = 0;
+	;
+	LK.on('down', function (obj) {
 		var event = obj.event;
 		lastTouchX = event.global.x;
 		var currentTime = Date.now();
 		if (self.lastTapTime && currentTime - self.lastTapTime < 200) {
 			player.jump();
 		}
 		self.lastTapTime = currentTime;
 	});
-	stage.on('move', function (obj) {
+	LK.on('move', function (obj) {
 		if (lastTouchX !== null) {
 			var event = obj.event;
 			var currentTouchX = event.global.x;
 			var deltaX = currentTouchX - lastTouchX;
@@ -119,47 +166,27 @@
 				lastTouchX = currentTouchX;
 			}
 		}
 	});
-	stage.on('up', function (obj) {
+	LK.on('up', function (obj) {
 		lastTouchX = null;
 	});
-	var boxes = [];
-	var columns = [];
-	for (var i = 0; i < NUM_COLUMNS; i++) {
-		var column = new Column();
-		column.x = i * column.width;
-		columns.push(column);
-		self.addChild(column);
-	}
-	var floor = self.addChild(new Floor());
-	floor.y = 2732 - floor.height;
-	var player = self.addChild(new Player(floor));
-	player.x = Math.floor(2048 / 2 / COLUMN_WIDTH) * COLUMN_WIDTH + COLUMN_WIDTH / 2;
-	player.y = floor.y - player.height;
-	var scoreTxt = new Text2('0', {
-		size: 150,
-		fill: "#ffffff"
-	});
-	scoreTxt.anchor.set(.5, 0);
-	LK.gui.topCenter.addChild(scoreTxt);
-	var isGameOver = false;
-	var tickOffset = 0;
 	LK.on('tick', function () {
 		if (isGameOver) {
 			LK.effects.flashScreen(0xff0000, 1000);
 			LK.showGameOver();
 		}
+		player.update();
 		columns.forEach(function (column) {
 			column.update(boxes, tickOffset);
 		});
-		player.update();
-		for (var a = boxes.length - 1; a >= 0; a--) {
-			boxes[a].move();
-			if (boxes[a].y > 2732) {
-				boxes[a].destroy();
-				boxes.splice(a, 1);
-			} else if (player.intersects(boxes[a].hitbox)) {
+		for (var i = boxes.length - 1; i >= 0; i--) {
+			var box = boxes[i];
+			box.update();
+			if (box.y > STAGE_HEIGHT) {
+				box.destroy();
+				boxes.splice(i, 1);
+			} else if (player.intersects(box.hitbox)) {
 				isGameOver = true;
 			}
 		}
 	});