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

/**** 
* Classes
****/ 
// Nyan Cat class
var NyanCat = Container.expand(function () {
	var self = Container.call(this);
	// Rainbow trail (visual only, not collidable)
	var rainbow = self.attachAsset('rainbow', {
		anchorX: 1,
		anchorY: 0.5,
		x: -90,
		y: 0,
		scaleY: 1.2
	});
	// Nyan Cat sprite
	var cat = self.attachAsset('nyanCat', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 0,
		y: 0
	});
	// For collision, use the cat's bounds (not rainbow)
	self.getCollisionBounds = function () {
		return {
			x: self.x - cat.width / 2,
			y: self.y - cat.height / 2,
			width: cat.width,
			height: cat.height
		};
	};
	// Flash effect on hit
	self.flash = function () {
		tween(cat, {
			alpha: 0.3
		}, {
			duration: 80,
			onFinish: function onFinish() {
				tween(cat, {
					alpha: 1
				}, {
					duration: 120
				});
			}
		});
	};
	// Rainbow parallax movement for quality polish
	self.update = function () {
		// Rainbow trail parallax: slight horizontal movement for visual polish
		rainbow.x = -90 + Math.sin(LK.ticks * 0.12) * 12;
		// Bobbing handled in main update
	};
	return self;
});
// Obstacle class (cloud or star)
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	// Randomly choose cloud or star
	var isStar = Math.random() < 0.4;
	var assetId = isStar ? 'star' : 'cloud';
	var asset = self.attachAsset(assetId, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.isStar = isStar;
	// For collision
	self.getCollisionBounds = function () {
		return {
			x: self.x - asset.width / 2,
			y: self.y - asset.height / 2,
			width: asset.width,
			height: asset.height
		};
	};
	// Speed will be set on spawn
	self.speed = 0;
	self.update = function () {
		self.x -= self.speed;
	};
	return self;
});
// Treat class (collectible)
var Treat = Container.expand(function () {
	var self = Container.call(this);
	var treat = self.attachAsset('treat', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// For collision
	self.getCollisionBounds = function () {
		return {
			x: self.x - treat.width / 2,
			y: self.y - treat.height / 2,
			width: treat.width,
			height: treat.height
		};
	};
	// Speed will be set on spawn
	self.speed = 0;
	self.update = function () {
		self.x -= self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	// No title, no description
	// Always backgroundColor is black
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
// Starfield background
var starfieldStars = [];
var STARFIELD_STAR_COUNT = 32;
for (var s = 0; s < STARFIELD_STAR_COUNT; s++) {
	var star = LK.getAsset('star', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: Math.random() * 0.5 + 0.2,
		scaleY: Math.random() * 0.5 + 0.2,
		alpha: Math.random() * 0.5 + 0.2,
		x: Math.random() * 3840,
		y: Math.random() * 2160
	});
	star.zIndex = -1000; // ensure behind everything
	game.addChild(star);
	star.speed = Math.random() * 0.7 + 0.2;
	starfieldStars.push(star);
}
// Music
// Sound effects
// Rainbow trail
// Treat (pop tart)
// Obstacle (star)
// Obstacle (cloud)
// Nyan Cat (main character)
// Game area margins
var GAME_TOP = 0;
var GAME_BOTTOM = 2160;
var GAME_LEFT = 0;
var GAME_RIGHT = 3840;
// Avoid top left 100x100 for menu
var SAFE_TOP = 120;
// Main character
var nyanCat = new NyanCat();
game.addChild(nyanCat);
// Center Nyan Cat horizontally, place at 60% height
nyanCat.x = 3840 * 0.25;
nyanCat.y = 2160 * 0.6;
var nyanCatBaseY = nyanCat.y;
// Score display
var scoreTxt = new Text2('0', {
	size: 220,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Arrays for obstacles and treats
var obstacles = [];
var treats = [];
// Difficulty parameters
var baseSpeed = 12;
var speed = baseSpeed;
var spawnInterval = 70; // ticks between spawns
var treatInterval = 110; // ticks between treat spawns
var minSpawnInterval = 30;
var maxSpeed = 32;
// Dragging
var dragNode = null;
// Last collision state
var lastHit = false;
// Play music
LK.playMusic('nyanMusic');
// Helper: collision check (AABB)
function isColliding(a, b) {
	var ab = a.getCollisionBounds();
	var bb = b.getCollisionBounds();
	return ab.x < bb.x + bb.width && ab.x + ab.width > bb.x && ab.y < bb.y + bb.height && ab.y + ab.height > bb.y;
}
// Move handler (drag Nyan Cat)
function handleMove(x, y, obj) {
	if (dragNode) {
		// Clamp to game area, avoid top left 100x100
		var cat = dragNode;
		var bounds = cat.getCollisionBounds();
		var halfW = bounds.width / 2;
		var halfH = bounds.height / 2;
		var minX = GAME_LEFT + halfW;
		var maxX = GAME_RIGHT - halfW;
		var minY = Math.max(GAME_TOP + halfH, SAFE_TOP + halfH);
		var maxY = GAME_BOTTOM - halfH;
		cat.x = Math.max(minX, Math.min(maxX, x));
		cat.y = Math.max(minY, Math.min(maxY, y));
	}
}
game.move = handleMove;
game.down = function (x, y, obj) {
	// Only allow drag if touch is on Nyan Cat
	var bounds = nyanCat.getCollisionBounds();
	if (x >= bounds.x && x <= bounds.x + bounds.width && y >= bounds.y && y <= bounds.y + bounds.height) {
		dragNode = nyanCat;
		handleMove(x, y, obj);
	}
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Game update loop
game.update = function () {
	// Animate starfield
	for (var s = 0; s < starfieldStars.length; s++) {
		var star = starfieldStars[s];
		star.x -= star.speed;
		// Twinkle: animate alpha for twinkling effect
		star.alpha = 0.25 + Math.abs(Math.sin(LK.ticks * 0.01 + s)) * 0.55;
		if (star.x < -100) {
			star.x = 3840 + 100;
			star.y = Math.random() * 2160;
			star.alpha = Math.random() * 0.5 + 0.2;
			star.scaleX = star.scaleY = Math.random() * 0.5 + 0.2;
		}
	}
	// Increase difficulty over time
	if (LK.ticks % 180 === 0 && speed < maxSpeed) {
		speed += 1.2;
		spawnInterval = Math.max(minSpawnInterval, spawnInterval - 4);
	}
	// Spawn obstacles
	if (LK.ticks % spawnInterval === 0) {
		var obs = new Obstacle();
		obs.speed = speed;
		// Random Y, avoid top 100px
		var asset = obs.children[0];
		var minY = SAFE_TOP + asset.height / 2;
		var maxY = GAME_BOTTOM - asset.height / 2;
		obs.x = GAME_RIGHT + asset.width / 2 + 10;
		obs.y = Math.random() * (maxY - minY) + minY;
		obstacles.push(obs);
		game.addChild(obs);
	}
	// Spawn treats
	if (LK.ticks % treatInterval === 0) {
		var treat = new Treat();
		treat.speed = speed * 0.95;
		var asset = treat.children[0];
		var minY = SAFE_TOP + asset.height / 2;
		var maxY = GAME_BOTTOM - asset.height / 2;
		treat.x = GAME_RIGHT + asset.width / 2 + 10;
		treat.y = Math.random() * (maxY - minY) + minY;
		treats.push(treat);
		game.addChild(treat);
	}
	// Update obstacles
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obs = obstacles[i];
		obs.update();
		// Remove if off screen
		if (obs.x < -300) {
			obs.destroy();
			obstacles.splice(i, 1);
			continue;
		}
		// Collision with Nyan Cat
		var hit = isColliding(obs, nyanCat);
		if (hit && !lastHit) {
			// Flash, play sound, game over
			nyanCat.flash();
			LK.getSound('hit').play();
			LK.effects.flashScreen(0xff0000, 800);
			LK.showGameOver();
			lastHit = true;
			break; // Stop further checks
		}
	}
	// Update treats
	for (var j = treats.length - 1; j >= 0; j--) {
		var treat = treats[j];
		treat.update();
		// Remove if off screen
		if (treat.x < -200) {
			treat.destroy();
			treats.splice(j, 1);
			continue;
		}
		// Collision with Nyan Cat
		if (isColliding(treat, nyanCat)) {
			LK.setScore(LK.getScore() + 1);
			scoreTxt.setText(LK.getScore());
			LK.getSound('collect').play();
			// Animate treat
			tween(treat, {
				scaleX: 2.1,
				scaleY: 2.1,
				alpha: 0
			}, {
				duration: 220,
				ease: "outBack",
				onFinish: function onFinish() {
					// Sparkle burst effect
					for (var sp = 0; sp < 7; sp++) {
						var sparkle = LK.getAsset('star', {
							anchorX: 0.5,
							anchorY: 0.5,
							scaleX: 0.3 + Math.random() * 0.2,
							scaleY: 0.3 + Math.random() * 0.2,
							alpha: 0.8,
							x: treat.x,
							y: treat.y
						});
						game.addChild(sparkle);
						var angle = Math.PI * 2 * (sp / 7) + Math.random() * 0.3;
						var dist = 120 + Math.random() * 60;
						tween(sparkle, {
							x: treat.x + Math.cos(angle) * dist,
							y: treat.y + Math.sin(angle) * dist,
							alpha: 0
						}, {
							duration: 320 + Math.random() * 120,
							onFinish: function (sparkle) {
								return function () {
									sparkle.destroy();
								};
							}(sparkle)
						});
					}
					treat.destroy();
				}
			});
			treats.splice(j, 1);
			continue;
		}
	}
	// Nyan Cat idle bobbing and lively animation
	if (!dragNode) {
		nyanCat.y = nyanCatBaseY + Math.sin(LK.ticks * 0.08) * 22;
		// Subtle rotation and scale for lively effect
		if (nyanCat.children && nyanCat.children.length > 1) {
			var catSprite = nyanCat.children[1];
			catSprite.rotation = Math.sin(LK.ticks * 0.07) * 0.08;
			catSprite.scaleX = 1 + Math.sin(LK.ticks * 0.11) * 0.04;
			catSprite.scaleY = 1 + Math.cos(LK.ticks * 0.13) * 0.04;
		}
	}
	// Reset lastHit if not colliding
	if (!obstacles.some(function (obs) {
		return isColliding(obs, nyanCat);
	})) {
		lastHit = false;
	}
};
// Reset score on game start
LK.setScore(0);
scoreTxt.setText('0');

===================================================================
--- original.js
+++ change.js
@@ -128,10 +128,10 @@
 		anchorY: 0.5,
 		scaleX: Math.random() * 0.5 + 0.2,
 		scaleY: Math.random() * 0.5 + 0.2,
 		alpha: Math.random() * 0.5 + 0.2,
-		x: Math.random() * 2048,
-		y: Math.random() * 2732
+		x: Math.random() * 3840,
+		y: Math.random() * 2160
 	});
 	star.zIndex = -1000; // ensure behind everything
 	game.addChild(star);
 	star.speed = Math.random() * 0.7 + 0.2;
@@ -145,23 +145,23 @@
 // Obstacle (cloud)
 // Nyan Cat (main character)
 // Game area margins
 var GAME_TOP = 0;
-var GAME_BOTTOM = 2732;
+var GAME_BOTTOM = 2160;
 var GAME_LEFT = 0;
-var GAME_RIGHT = 2048;
+var GAME_RIGHT = 3840;
 // Avoid top left 100x100 for menu
 var SAFE_TOP = 120;
 // Main character
 var nyanCat = new NyanCat();
 game.addChild(nyanCat);
 // Center Nyan Cat horizontally, place at 60% height
-nyanCat.x = 2048 * 0.25;
-nyanCat.y = 2732 * 0.6;
+nyanCat.x = 3840 * 0.25;
+nyanCat.y = 2160 * 0.6;
 var nyanCatBaseY = nyanCat.y;
 // Score display
 var scoreTxt = new Text2('0', {
-	size: 120,
+	size: 220,
 	fill: "#fff"
 });
 scoreTxt.anchor.set(0.5, 0);
 LK.gui.top.addChild(scoreTxt);
@@ -223,10 +223,10 @@
 		star.x -= star.speed;
 		// Twinkle: animate alpha for twinkling effect
 		star.alpha = 0.25 + Math.abs(Math.sin(LK.ticks * 0.01 + s)) * 0.55;
 		if (star.x < -100) {
-			star.x = 2048 + 100;
-			star.y = Math.random() * 2732;
+			star.x = 3840 + 100;
+			star.y = Math.random() * 2160;
 			star.alpha = Math.random() * 0.5 + 0.2;
 			star.scaleX = star.scaleY = Math.random() * 0.5 + 0.2;
 		}
 	}
@@ -318,9 +318,9 @@
 							y: treat.y
 						});
 						game.addChild(sparkle);
 						var angle = Math.PI * 2 * (sp / 7) + Math.random() * 0.3;
-						var dist = 80 + Math.random() * 40;
+						var dist = 120 + Math.random() * 60;
 						tween(sparkle, {
 							x: treat.x + Math.cos(angle) * dist,
 							y: treat.y + Math.sin(angle) * dist,
 							alpha: 0