/**** 
* Classes
****/
// Hero class
var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroGraphics = self.attachAsset('hero', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.update = function () {
		// Hero update logic
	};
	self.shoot = function () {
		// Hero shooting logic
	};
});
// Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 2;
	self.move = function () {
		self.y += self.speed;
	};
	self.shoot = function () {
		// Enemy shooting logic
	};
});
// HeroBullet class
var HeroBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('heroBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -10;
	self.move = function () {
		self.y += self.speed;
	};
});
// EnemyBullet class
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('enemyBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.move = function () {
		self.y += self.speed;
	};
});

/**** 
* Initialize Game
****/
var game = new LK.Game({
	backgroundColor: 0x000000 // Init game with black background
});

/**** 
* Game Code
****/
// Initialize hero
// Define assets for the hero, enemies, and bullets
var hero = game.addChild(new Hero());
hero.x = 2048 / 2;
hero.y = 2732 - 150;
// Initialize arrays for bullets and enemies
var heroBullets = [];
var enemyBullets = [];
var enemies = [];
// Game tick event
LK.on('tick', function () {
	// Update hero
	hero.update();
	// Move and check hero bullets
	for (var i = heroBullets.length - 1; i >= 0; i--) {
		heroBullets[i].move();
		for (var k = enemies.length - 1; k >= 0; k--) {
			if (heroBullets[i] && heroBullets[i].intersects(enemies[k])) {
				enemies[k].destroy();
				enemies.splice(k, 1);
				heroBullets[i].destroy();
				heroBullets.splice(i, 1);
				break;
			}
		}
		if (heroBullets[i] && heroBullets[i].y < 0) {
			heroBullets[i].destroy();
			heroBullets.splice(i, 1);
		}
	}
	// Move and check enemy bullets
	for (var j = enemyBullets.length - 1; j >= 0; j--) {
		enemyBullets[j].move();
		if (enemyBullets[j].intersects(hero)) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
		if (enemyBullets[j] && enemyBullets[j].y > 2732) {
			enemyBullets[j].destroy();
			enemyBullets.splice(j, 1);
		}
	}
	// Move enemies and check for game over
	for (var k = enemies.length - 1; k >= 0; k--) {
		enemies[k].move();
		if (enemies[k].y > 2732) {
			LK.showGameOver();
		}
	}
	// Spawn enemies
	if (LK.ticks % 120 == 0) {
		var newEnemy = new Enemy();
		newEnemy.x = Math.random() * (2048 - newEnemy.width) + newEnemy.width / 2;
		newEnemy.y = -newEnemy.height / 2;
		enemies.push(newEnemy);
		game.addChild(newEnemy);
	}
});
// Touch event to move hero
game.on('down', function (obj) {
	var pos = obj.event.getLocalPosition(game);
	hero.x = pos.x;
});
// Touch event to shoot
game.on('up', function (obj) {
	var bullet = new HeroBullet();
	bullet.x = hero.x;
	bullet.y = hero.y - hero.height / 2;
	heroBullets.push(bullet);
	game.addChild(bullet);
});

===================================================================
--- original.js
+++ change.js
@@ -29,9 +29,9 @@
 	self.shoot = function () {
 		// Enemy shooting logic
 	};
 });
-// Bullet class for hero
+// HeroBullet class
 var HeroBullet = Container.expand(function () {
 	var self = Container.call(this);
 	var bulletGraphics = self.attachAsset('heroBullet', {
 		anchorX: 0.5,
@@ -41,9 +41,9 @@
 	self.move = function () {
 		self.y += self.speed;
 	};
 });
-// Bullet class for enemies
+// EnemyBullet class
 var EnemyBullet = Container.expand(function () {
 	var self = Container.call(this);
 	var bulletGraphics = self.attachAsset('enemyBullet', {
 		anchorX: 0.5,
@@ -64,10 +64,10 @@
 
 /**** 
 * Game Code
 ****/
-// Define assets for the hero, enemies, and bullets
 // Initialize hero
+// Define assets for the hero, enemies, and bullets
 var hero = game.addChild(new Hero());
 hero.x = 2048 / 2;
 hero.y = 2732 - 150;
 // Initialize arrays for bullets and enemies