/**** 
* Classes
****/ 
// Airplane class
var Airplane = Container.expand(function () {
	var self = Container.call(this);
	var airplaneGraphics = self.attachAsset('airplane', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -5;
	self.update = function () {
		self.x += self.speed;
		if (self.x < -airplaneGraphics.width / 2) {
			self.x = 2048 + airplaneGraphics.width / 2;
		}
	};
});
// Roof class
var Roof = Container.expand(function () {
	var self = Container.call(this);
	var roofGraphics = self.attachAsset('roof', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -5;
	self.update = function () {
		self.x += self.speed;
		if (self.x < -roofGraphics.width / 2) {
			self.x = 2048 + roofGraphics.width / 2;
		}
	};
});
//<Assets used in the game will automatically appear here>
//<Write imports for supported plugins here>
// Santa's Sleigh class
var SantaSleigh = Container.expand(function () {
	var self = Container.call(this);
	var sleighGraphics = self.attachAsset('santaSleigh', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.velocity = 0;
	self.gravity = 0.5;
	self.lift = -10;
	self.update = function () {
		self.velocity += self.gravity;
		self.y += self.velocity;
		if (self.y > 2732 - sleighGraphics.height / 2) {
			self.y = 2732 - sleighGraphics.height / 2;
			self.velocity = 0;
		}
		if (self.y < sleighGraphics.height / 2) {
			self.y = sleighGraphics.height / 2;
			self.velocity = 0;
		}
	};
	self.flap = function () {
		self.velocity = self.lift;
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87CEEB // Sky blue background
});

/**** 
* Game Code
****/ 
// Initialize game elements
var santaSleigh = game.addChild(new SantaSleigh());
santaSleigh.x = 450;
santaSleigh.y = 1366; // Center vertically
var roofs = [];
var airplanes = [];
// Create roofs
for (var i = 0; i < 5; i++) {
	var roof = new Roof();
	roof.x = 2048 + i * 400;
	roof.y = 2732 - 100; // Bottom of the screen
	roofs.push(roof);
	game.addChild(roof);
}
// Create airplanes
for (var j = 0; j < 3; j++) {
	var airplane = new Airplane();
	airplane.x = 2048 + j * 1000;
	airplane.y = 200; // Upper half of the screen
	airplanes.push(airplane);
	game.addChild(airplane);
}
// Handle game events
game.down = function (x, y, obj) {
	santaSleigh.flap();
};
// Update game state
game.update = function () {
	santaSleigh.update();
	for (var i = 0; i < roofs.length; i++) {
		roofs[i].update();
		if (santaSleigh.intersects(roofs[i])) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	}
	for (var j = 0; j < airplanes.length; j++) {
		airplanes[j].update();
		if (santaSleigh.intersects(airplanes[j])) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	}
};

===================================================================
--- original.js
+++ change.js