/**** 
* Classes
****/ 
// Assets will be automatically created and loaded during gameplay
// Bird class
var Bird = Container.expand(function () {
	var self = Container.call(this);
	var birdGraphics = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speedY = 2;
	self.gravity = 1;
	self.flapStrength = -30;
	self.update = function () {
		self.speedY += self.gravity;
		self.y += self.speedY;
		if (self.y > 2732 - birdGraphics.height / 2) {
			self.y = 2732 - birdGraphics.height / 2;
			self.speedY = 0;
		}
		if (self.y < birdGraphics.height / 2) {
			self.y = birdGraphics.height / 2;
			self.speedY = 0;
		}
	};
	self.flap = function () {
		self.speedY = self.flapStrength;
	};
});
// Wall class
var Wall = Container.expand(function () {
	var self = Container.call(this);
	var wallGraphics = self.attachAsset('wall', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speedX = -5;
	self.update = function () {
		self.x += self.speedX;
		if (self.x < -wallGraphics.width / 2) {
			self.destroy();
		}
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: x0000FF
	//Init game with black background
});

/**** 
* Game Code
****/ 
var bird = game.addChild(new Bird());
bird.x = 2048 / 2;
bird.y = 2732 / 2;
var walls = [];
var score = 0;
var scoreTxt = new Text2('0', {
	size: 150,
	fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
function createWall() {
	var wall = new Wall();
	wall.x = 2048 + wall.width / 2;
	wall.y = Math.random() * (2732 - wall.height) + wall.height / 2;
	walls.push(wall);
	game.addChild(wall);
}
function handleMove(x, y, obj) {
	// No-op for now
}
game.down = function (x, y, obj) {
	bird.flap();
};
game.update = function () {
	bird.update();
	for (var i = walls.length - 1; i >= 0; i--) {
		walls[i].update();
		if (bird.intersects(walls[i])) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	}
	if (LK.ticks % 60 == 0) {
		createWall();
	}
	scoreTxt.setText(score);
};

===================================================================
--- original.js
+++ change.js
@@ -47,9 +47,9 @@
 /**** 
 * Initialize Game
 ****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
+	backgroundColor: x0000FF
 	//Init game with black background
 });
 
 /****