/**** 
* 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
	});
	// Add a soft highlight to rainbow for polish
	rainbow.alpha = 0.92;
	rainbow.tint = 0xffe0fa;
	// Nyan Cat sprite
	var cat = self.attachAsset('nyanCat', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 0,
		y: 0
	});
	// Add a soft shadow to Nyan Cat for depth
	cat.alpha = 1;
	cat.tint = 0xffffff;
	self.catShadow = LK.getAsset('nyanCat', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 8,
		y: 18
	});
	self.catShadow.alpha = 0.22;
	self.catShadow.tint = 0x000000;
	self.addChildAt(self.catShadow, 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
	});
	// Add soft shadow for depth
	self.shadow = self.attachAsset(assetId, {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 10,
		y: 18
	});
	self.shadow.alpha = 0.18;
	self.shadow.tint = 0x000000;
	self.addChildAt(self.shadow, 0);
	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
	});
	// Add soft shadow for treat
	self.shadow = self.attachAsset('treat', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 10,
		y: 18
	});
	self.shadow.alpha = 0.18;
	self.shadow.tint = 0x000000;
	self.addChildAt(self.shadow, 0);
	// 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
****/ 
// Planet assets for background planets (variety of colors/sizes)
// 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);
}
// Animated background clouds for more lively scene
var bgClouds = [];
var BG_CLOUD_COUNT = 7;
for (var c = 0; c < BG_CLOUD_COUNT; c++) {
	var cloud = LK.getAsset('cloud', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 0.7 + Math.random() * 0.7,
		scaleY: 0.7 + Math.random() * 0.7,
		alpha: 0.18 + Math.random() * 0.13,
		x: Math.random() * 3840,
		y: 180 + Math.random() * (2160 - 360)
	});
	cloud.zIndex = -950; // behind planets, in front of stars
	cloud.speed = 0.5 + Math.random() * 0.7;
	game.addChild(cloud);
	bgClouds.push(cloud);
}
// Planets background system
var planetTypes = [{
	id: 'planetBlue',
	minScale: 0.7,
	maxScale: 1.1,
	alpha: 0.38
}, {
	id: 'planetRed',
	minScale: 0.6,
	maxScale: 1.0,
	alpha: 0.32
}, {
	id: 'planetGreen',
	minScale: 0.5,
	maxScale: 0.9,
	alpha: 0.28
}, {
	id: 'planetYellow',
	minScale: 0.4,
	maxScale: 0.7,
	alpha: 0.22
}, {
	id: 'planetPurple',
	minScale: 0.6,
	maxScale: 1.0,
	alpha: 0.30
}];
var planets = [];
var PLANET_COUNT = 3;
for (var p = 0; p < PLANET_COUNT; p++) {
	var type = planetTypes[Math.floor(Math.random() * planetTypes.length)];
	var scale = type.minScale + Math.random() * (type.maxScale - type.minScale);
	var planet = LK.getAsset(type.id, {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: scale,
		scaleY: scale,
		alpha: type.alpha,
		x: Math.random() * 3840,
		y: Math.random() * 2160
	});
	planet.zIndex = -900; // behind everything except stars
	planet.speed = 0.7 + Math.random() * 0.7; // slower than stars
	planet._planetType = type;
	game.addChild(planet);
	planets.push(planet);
}
// Timer for planet respawn
var planetRespawnTimer = 0;
// 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;
		// Add subtle color cycling for richer starfield
		if (s % 3 === 0) {
			star.tint = 0x99ccff + Math.floor(Math.sin(LK.ticks * 0.01 + s) * 0x22);
		} else if (s % 3 === 1) {
			star.tint = 0xffeedd + Math.floor(Math.cos(LK.ticks * 0.012 + s) * 0x22);
		} else {
			star.tint = 0xffffff;
		}
		// Add a soft glow effect by pulsing scale
		star.scaleX = star.scaleY = star.scaleX + Math.abs(Math.sin(LK.ticks * 0.02 + s)) * 0.08;
		// Reset if off screen
		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;
			star.tint = 0xffffff;
		}
	}
	// Animate background clouds for lively sky
	for (var c = 0; c < bgClouds.length; c++) {
		var cloud = bgClouds[c];
		cloud.x -= cloud.speed;
		// Gentle vertical floating for more life
		cloud.y += Math.sin(LK.ticks * 0.008 + c) * 0.18;
		if (cloud.x < -cloud.width * cloud.scaleX) {
			cloud.x = 3840 + cloud.width * cloud.scaleX + Math.random() * 200;
			cloud.y = 180 + Math.random() * (2160 - 360);
			cloud.scaleX = cloud.scaleY = 0.7 + Math.random() * 0.7;
			cloud.alpha = 0.18 + Math.random() * 0.13;
			cloud.speed = 0.5 + Math.random() * 0.7;
		}
	}
	// Animate planets (move left, respawn if off screen, occasionally spawn new)
	for (var p = 0; p < planets.length; p++) {
		var planet = planets[p];
		planet.x -= planet.speed;
		// Subtle slow rotation for visual polish
		planet.rotation += 0.0007 + Math.random() * 0.0005;
		// Add animated glow and color cycling for vibrancy
		var glowPulse = 0.98 + Math.abs(Math.sin(LK.ticks * 0.008 + p)) * 0.13;
		planet.scaleX = planet.scaleY = (planet._planetType ? planet._planetType.minScale + Math.random() * (planet._planetType.maxScale - planet._planetType.minScale) : 1) * glowPulse;
		if (planet._planetType && planet._planetType.id === 'planetBlue') {
			planet.tint = 0x7ecbff + Math.floor(Math.sin(LK.ticks * 0.01 + p) * 0x22);
		} else if (planet._planetType && planet._planetType.id === 'planetRed') {
			planet.tint = 0xffb3b3 + Math.floor(Math.cos(LK.ticks * 0.012 + p) * 0x22);
		} else if (planet._planetType && planet._planetType.id === 'planetGreen') {
			planet.tint = 0xbaffc9 + Math.floor(Math.sin(LK.ticks * 0.013 + p) * 0x22);
		} else if (planet._planetType && planet._planetType.id === 'planetYellow') {
			planet.tint = 0xfff7b2 + Math.floor(Math.cos(LK.ticks * 0.014 + p) * 0x22);
		} else if (planet._planetType && planet._planetType.id === 'planetPurple') {
			planet.tint = 0xe0b3ff + Math.floor(Math.sin(LK.ticks * 0.015 + p) * 0x22);
		} else {
			planet.tint = 0xffffff;
		}
		if (planet.x < -planet.width * planet.scaleX) {
			// Remove and respawn later
			planet.visible = false;
			planet._respawnTick = LK.ticks + 600 + Math.floor(Math.random() * 1200);
		}
	}
	// Respawn planets if their timer is up, and randomly show a new one every ~7-12 seconds
	for (var p = 0; p < planets.length; p++) {
		var planet = planets[p];
		if (!planet.visible && planet._respawnTick && LK.ticks > planet._respawnTick) {
			// Pick new type and scale
			var type = planetTypes[Math.floor(Math.random() * planetTypes.length)];
			var scale = type.minScale + Math.random() * (type.maxScale - type.minScale);
			planet.texture = LK.getAsset(type.id, {
				anchorX: 0.5,
				anchorY: 0.5
			}).texture;
			planet.scaleX = scale;
			planet.scaleY = scale;
			planet.alpha = type.alpha;
			planet.x = 3840 + planet.width * scale + Math.random() * 400;
			planet.y = 300 + Math.random() * (2160 - 600);
			planet.speed = 0.7 + Math.random() * 0.7;
			planet.rotation = Math.random() * Math.PI * 2;
			planet.visible = true;
			planet._planetType = type;
			planet._respawnTick = null;
		}
	}
	// 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() {
					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 and all game state on game start
LK.setScore(0);
scoreTxt.setText('0');
// Remove all obstacles and treats from game
for (var i = 0; i < obstacles.length; i++) {
	obstacles[i].destroy();
}
obstacles = [];
for (var j = 0; j < treats.length; j++) {
	treats[j].destroy();
}
treats = [];
// Reset Nyan Cat position and base Y
nyanCat.x = 3840 * 0.25;
nyanCat.y = 2160 * 0.6;
nyanCatBaseY = nyanCat.y;
// Reset difficulty
speed = baseSpeed;
spawnInterval = 70;
treatInterval = 110;
// Reset drag and collision state
dragNode = null;
lastHit = false;

===================================================================
--- original.js
+++ change.js
@@ -485,45 +485,8 @@
 			}, {
 				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)
-						});
-						// Sparkle twinkle for extra lively effect
-						tween(sparkle, {
-							scaleX: sparkle.scaleX * 1.7,
-							scaleY: sparkle.scaleY * 1.7,
-							alpha: 0.95
-						}, {
-							duration: 80 + Math.random() * 60,
-							yoyo: true,
-							repeat: 1
-						});
-					}
 					treat.destroy();
 				}
 			});
 			treats.splice(j, 1);