var HeroBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.createAsset('heroBullet', 'Hero Bullet Graphics', .5, .5);
	self.speed = 10;
	self.move = function () {
		self.y -= self.speed;
	};
});
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.createAsset('enemyBullet', 'Enemy Bullet Graphics', .5, .5);
	self.speed = 5;
	self.move = function () {
		self.y += self.speed;
	};
});
var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroGraphics = self.createAsset('hero', 'Hero Graphics', .5, .5);
});
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.createAsset('enemy', 'Enemy Graphics', .5, .5);
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var heroBullets = [];
	var enemyBullets = [];
	var enemies = [];
	var hero = self.addChild(new Hero());
	hero.x = 2048 / 2;
	hero.y = 2732 - 200;
	var spawnEnemy = function () {
		var enemy = new Enemy();
		enemy.x = Math.random() * 2048;
		enemy.y = 0;
		enemies.push(enemy);
		self.addChild(enemy);
	};
	var fireHeroBullet = function () {
		var bullet = new HeroBullet();
		bullet.x = hero.x;
		bullet.y = hero.y;
		heroBullets.push(bullet);
		self.addChild(bullet);
	};
	var fireEnemyBullet = function (enemy) {
		var bullet = new EnemyBullet();
		bullet.x = enemy.x;
		bullet.y = enemy.y;
		enemyBullets.push(bullet);
		self.addChild(bullet);
	};
	var handleMove = function (obj) {
		var event = obj.event;
		var pos = event.getLocalPosition(self);
		hero.x = pos.x;
	};
	stage.on('move', handleMove);
	LK.on('tick', function () {});
});

===================================================================
--- original.js
+++ change.js
@@ -56,24 +56,6 @@
 		var pos = event.getLocalPosition(self);
 		hero.x = pos.x;
 	};
 	stage.on('move', handleMove);
-	LK.on('tick', function () {
-		for (var i = 0; i < heroBullets.length; i++) {
-			heroBullets[i].move();
-		}
-		for (var i = 0; i < enemyBullets.length; i++) {
-			enemyBullets[i].move();
-		}
-		for (var i = 0; i < enemies.length; i++) {
-			if (Math.random() < 0.01) {
-				fireEnemyBullet(enemies[i]);
-			}
-		}
-		if (Math.random() < 0.01) {
-			spawnEnemy();
-		}
-		if (Math.random() < 0.1) {
-			fireHeroBullet();
-		}
-	});
+	LK.on('tick', function () {});
 });