/**** 
* Classes
****/ 
var Asteroid = Container.expand(function () {
	var self = Container.call(this);
	var asteroidGraphics = self.attachAsset('asteroid', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 3;
	self.update = function () {
		self.y += self.speed;
		if (self.y > 2732) {
			self.destroy();
		}
	};
});
// Bullet class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -20;
	self.update = function () {
		self.y += self.speed;
		if (self.y < 0) {
			self.destroy();
		}
	};
});
var Coin = Container.expand(function () {
	var self = Container.call(this);
	var coinGraphics = self.attachAsset('coin', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 3;
	self.update = function () {
		self.y += self.speed;
		if (self.y > 2732) {
			self.destroy();
		}
	};
});
// Assets will be automatically created and loaded during gameplay
// Hero class
var FireJet = Container.expand(function () {
	var self = Container.call(this);
	var fireJetGraphics = self.attachAsset('fireJet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 10;
	self.update = function () {
		// FireJet update logic
	};
});
// Zombie class
var Zombie = Container.expand(function () {
	var self = Container.call(this);
	var zombieGraphics = self.attachAsset('zombie', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 2;
	self.update = function () {
		self.y += self.speed;
		if (self.y > 2732) {
			self.destroy();
		}
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x1a1a1a // Init game with dark gray background
});

/**** 
* Game Code
****/ 
// Initialize variables
var hero;
var zombies = [];
var bullets = [];
var asteroids = [];
var score = 0;
var scoreTxt;
var coins = [];
// Initialize fire jet
fireJet = game.addChild(new FireJet());
fireJet.x = 2048 / 2;
fireJet.y = 2732 - 200;
// Initialize score text
scoreTxt = new Text2('0', {
	size: 150,
	fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Handle game move events
game.move = function (x, y, obj) {
	fireJet.x = x;
	fireJet.y = y;
};
// Handle game down events
game.down = function (x, y, obj) {
	var bullet = new Bullet();
	bullet.x = fireJet.x;
	bullet.y = fireJet.y;
	bullets.push(bullet);
	game.addChild(bullet);
	LK.getSound('shoot').play();
};
// Update game logic
game.update = function () {
	// Update fire jet
	fireJet.update();
	// Update zombies
	for (var i = zombies.length - 1; i >= 0; i--) {
		zombies[i].update();
		if (zombies[i].intersects(hero)) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	}
	// Update asteroids
	for (var j = asteroids.length - 1; j >= 0; j--) {
		asteroids[j].update();
		if (asteroids[j].intersects(hero)) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	}
	// Update coins
	for (var i = coins.length - 1; i >= 0; i--) {
		coins[i].update();
		if (coins[i].intersects(hero)) {
			coins[i].destroy();
			coins.splice(i, 1);
			score++;
			scoreTxt.setText(score);
		}
	}
	for (var j = bullets.length - 1; j >= 0; j--) {
		bullets[j].update();
		for (var k = zombies.length - 1; k >= 0; k--) {
			if (bullets[j].intersects(zombies[k])) {
				bullets[j].destroy();
				bullets.splice(j, 1);
				zombies[k].destroy();
				zombies.splice(k, 1);
				score++;
				scoreTxt.setText(score);
				break;
			}
		}
	}
	// Spawn new zombies
	if (LK.ticks % 60 == 0) {
		var zombie = new Zombie();
		zombie.x = Math.random() * 2048;
		zombie.y = -100;
		zombies.push(zombie);
		game.addChild(zombie);
	}
	// Spawn new asteroids
	if (LK.ticks % 120 == 0) {
		var asteroid = new Asteroid();
		asteroid.x = Math.random() * 2048;
		asteroid.y = -150;
		asteroids.push(asteroid);
		game.addChild(asteroid);
	}
	// Spawn new coins
	if (LK.ticks % 90 == 0) {
		var coin = new Coin();
		coin.x = Math.random() * 2048;
		coin.y = -50;
		coins.push(coin);
		game.addChild(coin);
	}
};

===================================================================
--- original.js
+++ change.js
@@ -45,17 +45,17 @@
 	};
 });
 // Assets will be automatically created and loaded during gameplay
 // Hero class
-var JetPilot = Container.expand(function () {
+var FireJet = Container.expand(function () {
 	var self = Container.call(this);
-	var jetPilotGraphics = self.attachAsset('jetPilot', {
+	var fireJetGraphics = self.attachAsset('fireJet', {
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
 	self.speed = 10;
 	self.update = function () {
-		// JetPilot update logic
+		// FireJet update logic
 	};
 });
 // Zombie class
 var Zombie = Container.expand(function () {
@@ -90,12 +90,12 @@
 var asteroids = [];
 var score = 0;
 var scoreTxt;
 var coins = [];
-// Initialize jet pilot
-jetPilot = game.addChild(new JetPilot());
-jetPilot.x = 2048 / 2;
-jetPilot.y = 2732 - 200;
+// Initialize fire jet
+fireJet = game.addChild(new FireJet());
+fireJet.x = 2048 / 2;
+fireJet.y = 2732 - 200;
 // Initialize score text
 scoreTxt = new Text2('0', {
 	size: 150,
 	fill: "#ffffff"
@@ -103,24 +103,24 @@
 scoreTxt.anchor.set(0.5, 0);
 LK.gui.top.addChild(scoreTxt);
 // Handle game move events
 game.move = function (x, y, obj) {
-	jetPilot.x = x;
-	jetPilot.y = y;
+	fireJet.x = x;
+	fireJet.y = y;
 };
 // Handle game down events
 game.down = function (x, y, obj) {
 	var bullet = new Bullet();
-	bullet.x = jetPilot.x;
-	bullet.y = jetPilot.y;
+	bullet.x = fireJet.x;
+	bullet.y = fireJet.y;
 	bullets.push(bullet);
 	game.addChild(bullet);
 	LK.getSound('shoot').play();
 };
 // Update game logic
 game.update = function () {
-	// Update jet pilot
-	jetPilot.update();
+	// Update fire jet
+	fireJet.update();
 	// Update zombies
 	for (var i = zombies.length - 1; i >= 0; i--) {
 		zombies[i].update();
 		if (zombies[i].intersects(hero)) {