===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,308 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+// Monster class
+var Monster = Container.expand(function () {
+	var self = Container.call(this);
+	// Attach monster asset
+	var monsterSprite = self.attachAsset('monster', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	// Movement speed (pixels per tick)
+	self.speed = 0;
+	// Movement direction (radians)
+	self.direction = 0;
+	// Is monster alive
+	self.alive = true;
+	// Set random movement
+	self.setRandomMovement = function () {
+		// Speed: 2-6 px/tick
+		self.speed = 2 + Math.random() * 4;
+		// Direction: 0-2PI
+		self.direction = Math.random() * Math.PI * 2;
+	};
+	// Move monster
+	self.update = function () {
+		if (!self.alive) return;
+		// Move
+		self.x += Math.cos(self.direction) * self.speed;
+		self.y += Math.sin(self.direction) * self.speed;
+		// Bounce off walls
+		// Left
+		if (self.x - monsterSprite.width / 2 < 0) {
+			self.x = monsterSprite.width / 2;
+			self.direction = Math.PI - self.direction;
+		}
+		// Right
+		if (self.x + monsterSprite.width / 2 > 2048) {
+			self.x = 2048 - monsterSprite.width / 2;
+			self.direction = Math.PI - self.direction;
+		}
+		// Top
+		if (self.y - monsterSprite.height / 2 < 100) {
+			// leave top 100px for menu
+			self.y = 100 + monsterSprite.height / 2;
+			self.direction = -self.direction;
+		}
+		// Bottom
+		if (self.y + monsterSprite.height / 2 > 2732) {
+			self.y = 2732 - monsterSprite.height / 2;
+			self.direction = -self.direction;
+		}
+	};
+	// Handle tap
+	self.down = function (x, y, obj) {
+		if (!self.alive) return;
+		self.alive = false;
+		// Show hit effect
+		var hit = LK.getAsset('monsterHit', {
+			anchorX: 0.5,
+			anchorY: 0.5,
+			x: 0,
+			y: 0,
+			scaleX: 1,
+			scaleY: 1,
+			alpha: 1
+		});
+		self.addChild(hit);
+		// Animate hit effect
+		tween(hit, {
+			scaleX: 1.5,
+			scaleY: 1.5,
+			alpha: 0
+		}, {
+			duration: 300,
+			easing: tween.easeOut,
+			onFinish: function onFinish() {
+				hit.destroy();
+			}
+		});
+		// Animate monster fade out
+		tween(monsterSprite, {
+			alpha: 0
+		}, {
+			duration: 200,
+			onFinish: function onFinish() {
+				self.destroy();
+			}
+		});
+		// Add time and score
+		addTime(2); // +2 seconds per monster
+		setScore(getScore() + 1);
+		updateScoreText();
+		// Remove from monsters array
+		for (var i = 0; i < monsters.length; ++i) {
+			if (monsters[i] === self) {
+				monsters.splice(i, 1);
+				break;
+			}
+		}
+	};
+	return self;
+});
+// Tap effect class
+var TapEffect = Container.expand(function () {
+	var self = Container.call(this);
+	var tap = self.attachAsset('tapEffect', {
+		anchorX: 0.5,
+		anchorY: 0.5,
+		scaleX: 1,
+		scaleY: 1,
+		alpha: 0.7
+	});
+	// Animate
+	tween(tap, {
+		scaleX: 2,
+		scaleY: 2,
+		alpha: 0
+	}, {
+		duration: 300,
+		easing: tween.easeOut,
+		onFinish: function onFinish() {
+			self.destroy();
+		}
+	});
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
+	backgroundColor: 0x181c2a
+});
+
+/**** 
+* Game Code
+****/ 
+// Tap effect: yellow ellipse, 100x100
+// Monster hit effect: red ellipse, 160x160
+// Monster: green ellipse, 160x160
+// Global variables
+var monsters = [];
+var monsterSpawnInterval = 120; // ticks between spawns (2s)
+var monsterMax = 6; // max monsters on screen
+var timerMax = 20; // seconds to start
+var timer = timerMax; // current timer (seconds)
+var timerInterval = null;
+var timerBar = null;
+var timerBarBg = null;
+var timerText = null;
+var score = 0;
+var scoreText = null;
+var lastTick = 0;
+// Helper: get/set score
+function getScore() {
+	return score;
+}
+function setScore(val) {
+	score = val;
+}
+function updateScoreText() {
+	scoreText.setText(score + "");
+}
+// Helper: add time
+function addTime(sec) {
+	timer += sec;
+	if (timer > 99) timer = 99;
+	updateTimerText();
+}
+// Helper: update timer text
+function updateTimerText() {
+	timerText.setText(timer > 0 ? Math.ceil(timer) + "" : "0");
+}
+// Helper: update timer bar
+function updateTimerBar() {
+	var pct = Math.max(0, Math.min(1, timer / timerMax));
+	timerBar.width = 800 * pct;
+	if (pct > 0.5) timerBar.tint = 0x3ecf4c;else if (pct > 0.2) timerBar.tint = 0xffe066;else timerBar.tint = 0xff4444;
+}
+// Spawn a monster at random position
+function spawnMonster() {
+	if (monsters.length >= monsterMax) return;
+	var m = new Monster();
+	// Avoid top 100px (menu)
+	var margin = 100 + 80;
+	m.x = margin + Math.random() * (2048 - margin * 2);
+	m.y = margin + Math.random() * (2732 - margin * 2);
+	m.setRandomMovement();
+	monsters.push(m);
+	game.addChild(m);
+}
+// GUI: Score
+scoreText = new Text2("0", {
+	size: 120,
+	fill: "#fff"
+});
+scoreText.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreText);
+// GUI: Timer bar background
+timerBarBg = LK.getAsset('monster', {
+	anchorX: 0,
+	anchorY: 0.5,
+	x: 624,
+	y: 100,
+	width: 800,
+	height: 40,
+	tint: 0x222222
+});
+timerBarBg.alpha = 0.5;
+game.addChild(timerBarBg);
+// GUI: Timer bar
+timerBar = LK.getAsset('monster', {
+	anchorX: 0,
+	anchorY: 0.5,
+	x: 624,
+	y: 100,
+	width: 800,
+	height: 40,
+	tint: 0x3ecf4c
+});
+game.addChild(timerBar);
+// GUI: Timer text
+timerText = new Text2(timerMax + "", {
+	size: 90,
+	fill: "#fff"
+});
+timerText.anchor.set(0.5, 0.5);
+timerText.x = 2048 / 2;
+timerText.y = 100 + 20;
+game.addChild(timerText);
+// Position score at top center, below 100px
+scoreText.x = 2048 / 2;
+scoreText.y = 10 + 100;
+// Spawn initial monsters
+for (var i = 0; i < 3; ++i) {
+	spawnMonster();
+}
+// Timer tick
+function timerTick() {
+	timer -= 0.1;
+	if (timer < 0) timer = 0;
+	updateTimerText();
+	updateTimerBar();
+	if (timer <= 0) {
+		// Game over
+		LK.showGameOver();
+	}
+}
+// Start timer interval
+timerInterval = LK.setInterval(timerTick, 100);
+// Game update
+game.update = function () {
+	// Spawn monsters
+	if (LK.ticks - lastTick >= monsterSpawnInterval) {
+		spawnMonster();
+		lastTick = LK.ticks;
+	}
+	// Move monsters
+	for (var i = 0; i < monsters.length; ++i) {
+		monsters[i].update();
+	}
+	// Update timer bar
+	updateTimerBar();
+};
+// Handle tap on monsters or empty space
+game.down = function (x, y, obj) {
+	// Check if tap hits a monster (from topmost to bottom)
+	var tapped = false;
+	for (var i = monsters.length - 1; i >= 0; --i) {
+		var m = monsters[i];
+		// Only alive monsters
+		if (!m.alive) continue;
+		// Convert tap to monster local coords
+		var local = m.toLocal(game.toGlobal({
+			x: x,
+			y: y
+		}));
+		// Check if inside monster ellipse
+		var rx = m.children[0].width / 2;
+		var ry = m.children[0].height / 2;
+		if (local.x * local.x / (rx * rx) + local.y * local.y / (ry * ry) <= 1) {
+			m.down(x, y, obj);
+			tapped = true;
+			break;
+		}
+	}
+	// Tap effect
+	var tapFx = new TapEffect();
+	tapFx.x = x;
+	tapFx.y = y;
+	game.addChild(tapFx);
+};
+// Clean up on game over
+game.on('destroy', function () {
+	LK.clearInterval(timerInterval);
+	monsters = [];
+	score = 0;
+	timer = timerMax;
+	updateScoreText();
+	updateTimerText();
+	updateTimerBar();
 });
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