/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");

/**** 
* Classes
****/ 
// Balloon class (player)
var Balloon = Container.expand(function () {
	var self = Container.call(this);
	// Shadow
	var shadow = self.attachAsset('shadow', {
		anchorX: 0.5,
		anchorY: 0.5,
		y: 180
	});
	shadow.alpha = 0.18;
	// Balloon body
	var balloon = self.attachAsset('balloon', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// For a little bounce effect on move
	self.bounce = function () {
		tween(self, {
			scaleX: 1.08,
			scaleY: 0.92
		}, {
			duration: 80,
			easing: tween.cubicOut,
			onFinish: function onFinish() {
				tween(self, {
					scaleX: 1,
					scaleY: 1
				}, {
					duration: 120,
					easing: tween.cubicIn
				});
			}
		});
	};
	// For a little shake on hit
	self.shake = function () {
		tween(self, {
			x: self.x + 30
		}, {
			duration: 60,
			easing: tween.linear,
			onFinish: function onFinish() {
				tween(self, {
					x: self.x - 60
				}, {
					duration: 80,
					easing: tween.linear,
					onFinish: function onFinish() {
						tween(self, {
							x: self.x + 30
						}, {
							duration: 60,
							easing: tween.linear
						});
					}
				});
			}
		});
	};
	return self;
});
// Spike class (obstacle)
var Spike = Container.expand(function () {
	var self = Container.call(this);
	var spike = self.attachAsset('spike', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// For a little rotation
	self.rotationSpeed = (Math.random() - 0.5) * 0.04;
	// Speed will be set on spawn
	self.speedY = 8;
	// Update method
	self.update = function () {
		self.y += self.speedY;
		spike.rotation += self.rotationSpeed;
	};
	return self;
});

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

/**** 
* Game Code
****/ 
// LK.init.sound('spike_spawn', {volume: 0.4});
// Sound for spike spawn (optional, can be omitted if not wanted)
// Shadow for balloon
// Spike (obstacle)
// Balloon (player)
// Game area
var GAME_W = 2048;
var GAME_H = 2732;
// Balloon spawn position (centered horizontally, 80% down)
var BALLOON_START_X = GAME_W / 2;
var BALLOON_START_Y = GAME_H * 0.8;
// Balloon instance
var balloon = new Balloon();
balloon.x = BALLOON_START_X;
balloon.y = BALLOON_START_Y;
game.addChild(balloon);
// Obstacles array
var spikes = [];
// Score
var score = 0;
var scoreTxt = new Text2('0', {
	size: 120,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Time survived (for increasing difficulty)
var elapsedTicks = 0;
// Dragging
var dragNode = null;
// For collision detection
var lastColliding = false;
// For spike spawn timing
var spikeSpawnTick = 0;
var spikeSpawnInterval = 90; // Initial interval (ticks)
// Move handler (drag balloon)
function handleMove(x, y, obj) {
	if (dragNode) {
		// Clamp balloon inside game area (with margin)
		var margin = 100;
		var bx = Math.max(margin, Math.min(GAME_W - margin, x));
		var by = Math.max(margin + 100, Math.min(GAME_H - margin, y));
		dragNode.x = bx;
		dragNode.y = by;
		dragNode.bounce();
	}
	// Collision detection
	var colliding = false;
	for (var i = 0; i < spikes.length; i++) {
		if (balloon.intersects(spikes[i])) {
			colliding = true;
			break;
		}
	}
	if (!lastColliding && colliding) {
		// Hit!
		balloon.shake();
		LK.effects.flashScreen(0xff0000, 800);
		LK.showGameOver();
	}
	lastColliding = colliding;
}
// Touch/drag events
game.down = function (x, y, obj) {
	// Only start drag if touch is on balloon or close to it
	var dx = x - balloon.x;
	var dy = y - balloon.y;
	var dist = Math.sqrt(dx * dx + dy * dy);
	if (dist < 180) {
		dragNode = balloon;
		handleMove(x, y, obj);
	}
};
game.move = handleMove;
game.up = function (x, y, obj) {
	dragNode = null;
};
// Main update loop
game.update = function () {
	elapsedTicks++;
	// Increase difficulty over time
	if (elapsedTicks % 600 === 0 && spikeSpawnInterval > 30) {
		spikeSpawnInterval -= 8; // Spikes spawn more often
	}
	// Extra difficulty after score 10
	if (score >= 10) {
		spikeSpawnInterval = Math.max(18, spikeSpawnInterval - 1); // Faster spawn
	}
	// Spawn spikes
	spikeSpawnTick++;
	if (spikeSpawnTick >= spikeSpawnInterval) {
		spikeSpawnTick = 0;
		// Random X position (avoid spawning at extreme edges)
		var margin = 160;
		var sx = margin + Math.random() * (GAME_W - 2 * margin);
		// Create spike
		var spike = new Spike();
		spike.x = sx;
		spike.y = -60;
		// Speed increases with time
		var minSpeed = 10 + Math.floor(elapsedTicks / 600) * 2;
		var maxSpeed = 18 + Math.floor(elapsedTicks / 600) * 2;
		if (score >= 10) {
			minSpeed += 6;
			maxSpeed += 8;
		}
		spike.speedY = minSpeed + Math.random() * (maxSpeed - minSpeed);
		spikes.push(spike);
		game.addChild(spike);
		// Optionally play sound
		// LK.getSound('spike_spawn').play();
	}
	// Update spikes
	for (var i = spikes.length - 1; i >= 0; i--) {
		var s = spikes[i];
		s.update();
		// If spike goes off screen, remove and increase score
		if (s.y > GAME_H + 100) {
			s.destroy();
			spikes.splice(i, 1);
			score++;
			scoreTxt.setText(score);
		}
	}
};
// Center score text horizontally
scoreTxt.setText(score);
scoreTxt.anchor.set(0.5, 0);
// Place score at top center, but not in top 100px (menu area)
scoreTxt.y = 40;
// Set background color (already set in init, but can be changed here if needed)
// game.setBackgroundColor(0xb3e0ff);

===================================================================
--- original.js
+++ change.js
@@ -89,9 +89,9 @@
 /**** 
 * Initialize Game
 ****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
+	backgroundColor: 0xffffff
 });
 
 /**** 
 * Game Code