/**** 
* Classes
****/
var PlayButton = Container.expand(function () {
	var self = Container.call(this);
	var playButtonGraphics = self.attachAsset('playbutton', {
		anchorX: 0.5,
		anchorY: 0.5
	});
});
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 10;
	self.invulnerabilityTicks = 16;
	self.move = function () {
		self.x += self.speedX;
		self.y += self.speedY;
		if (self.x < 0 || self.x > 2048) {
			self.speedX *= -1;
			self.x = self.x < 0 ? 0 : 2048;
		}
		if (self.y < 0 || self.y > 2732) {
			self.speedY *= -1;
			self.y = self.y < 0 ? 0 : 2732;
		}
		if (self.invulnerabilityTicks > 0) {
			self.invulnerabilityTicks--;
		}
	};
});
var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroGraphics = self.attachAsset('hero', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speedX = 0;
	self.speedY = 0;
	self.update = function () {
		self.x += self.speedX;
		self.y += self.speedY;
		if (self.x < 0 || self.x > 2048) {
			self.speedX *= -1;
		}
		if (self.y < 0 || self.y > 2732) {
			self.speedY *= -1;
		}
	};
});
var Monster = Container.expand(function () {
	var self = Container.call(this);
	var monsterGraphics = self.attachAsset('monster', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 2;
	self.update = function () {
		if (hero.visible) {
			var dx = hero.x - self.x;
			var dy = hero.y - self.y;
			var magnitude = Math.sqrt(dx * dx + dy * dy);
			self.x += self.speed * dx / magnitude;
			self.y += self.speed * dy / magnitude;
		}
	};
});
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obstacleGraphics = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
});

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

/**** 
* Game Code
****/
// Add the 'Background' image to the visible playing area
var background = LK.getAsset('Background', {
	anchorX: 0.1,
	anchorY: 0.1,
	width: 2048 * 1.25,
	height: 2732 * 1.25,
	x: 0,
	y: 0
});
game.addChild(background);
// Create border around the visible area of the screen
var playButton = game.addChild(new PlayButton());
playButton.x = 2048 / 2;
playButton.y = 2732 / 3;
var hero = game.addChild(new Hero());
hero.x = 2048 / 2;
hero.y = 2732 / 2;
hero.visible = false;
var monster = game.addChild(new Monster());
monster.x = 2048 / 2;
monster.y = 0;
monster.visible = false;
var obstacle = game.addChild(new Obstacle());
obstacle.x = 2048 / 2;
obstacle.y = 0;
LK.on('tick', function () {
	hero.update();
	monster.update();
	var bulletsToRemove = [];
	for (var i = bullets.length - 1; i >= 0; i--) {
		bullets[i].move();
		if (bullets[i].y < 0 || hero.intersects(bullets[i]) && bullets[i].invulnerabilityTicks <= 0) {
			bulletsToRemove.push(i);
		}
	}
	for (var i = 0; i < bulletsToRemove.length; i++) {
		bullets[bulletsToRemove[i]].destroy();
		bullets.splice(bulletsToRemove[i], 1);
	}
	bulletCountText.setText('Propulsion Orbs: ' + (11 - bullets.length + 1));
});
var bullets = [];
var bulletCountText = new Text2('Propulsion Orbs: 8', {
	size: 50,
	fill: '#ffffff'
});
bulletCountText.anchor.set(1, 1);
LK.gui.bottomRight.addChild(bulletCountText);
var instructions1 = new Text2('Survive alien attacks in a space container.', {
	size: 50,
	fill: '#ffffff'
});
instructions1.anchor.set(0.5, 0.5);
LK.gui.center.addChild(instructions1);
var instructions2 = new Text2('Manage resources and outwit foes in Cosmic Container: Alien Ambush.', {
	size: 50,
	fill: '#ffffff'
});
instructions2.anchor.set(0.5, 0.5);
instructions2.y = instructions1.y + instructions1.height;
LK.gui.center.addChild(instructions2);
var instructions3 = new Text2('Tap the play button to start.', {
	size: 50,
	fill: '#ffffff'
});
instructions3.anchor.set(0.5, 0.5);
instructions3.y = instructions2.y + instructions2.height;
LK.gui.center.addChild(instructions3);
playButton.on('down', function (obj) {
	playButton.destroy();
	instructions1.destroy();
	instructions2.destroy();
	instructions3.destroy();
	hero.visible = true;
	monster.visible = true;
});
game.on('down', function (obj) {
	if (hero.visible && bullets.length < 12) {
		var event = obj.event;
		var pos = event.getLocalPosition(game);
		var bullet = new Bullet();
		bullet.x = hero.x;
		bullet.y = hero.y;
		var dx = pos.x - hero.x;
		var dy = pos.y - hero.y;
		var magnitude = Math.sqrt(dx * dx + dy * dy);
		bullet.speedX = bullet.speed * dx / magnitude;
		bullet.speedY = bullet.speed * dy / magnitude;
		bullets.push(bullet);
		game.addChild(bullet);
		bulletCountText.setText('Propulsion Orbs: ' + (12 - bullets.length));
		// Add velocity to the hero in opposite direction of the bullet
		hero.speedX += -bullet.speedX / 10;
		hero.speedY += -bullet.speedY / 10;
	}
});

===================================================================
--- original.js
+++ change.js
@@ -98,9 +98,9 @@
 game.addChild(background);
 // Create border around the visible area of the screen
 var playButton = game.addChild(new PlayButton());
 playButton.x = 2048 / 2;
-playButton.y = 2732 / 2;
+playButton.y = 2732 / 3;
 var hero = game.addChild(new Hero());
 hero.x = 2048 / 2;
 hero.y = 2732 / 2;
 hero.visible = false;