===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,151 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+// Monster class
+var Monster = Container.expand(function () {
+	var self = Container.call(this);
+	// Monster main body
+	var monsterBody = self.attachAsset('monster', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	// Monster hit overlay (hidden by default)
+	var monsterHit = self.attachAsset('monsterHit', {
+		anchorX: 0.5,
+		anchorY: 0.5,
+		alpha: 0
+	});
+	// Health bar background
+	var healthBarBg = self.attachAsset('healthBarBg', {
+		anchorX: 0.5,
+		anchorY: 1,
+		y: 240 // 400/2 + 40
+	});
+	// Health bar foreground
+	var healthBarFg = self.attachAsset('healthBarFg', {
+		anchorX: 0.5,
+		anchorY: 1,
+		y: 240
+	});
+	// Health values
+	self.maxHealth = 10;
+	self.health = self.maxHealth;
+	// Update health bar width
+	self.updateHealthBar = function () {
+		// Clamp health
+		if (self.health < 0) self.health = 0;
+		if (self.health > self.maxHealth) self.health = self.maxHealth;
+		// Set width proportional to health
+		healthBarFg.width = 300 * (self.health / self.maxHealth);
+	};
+	// Hit animation
+	self.hitAnim = function () {
+		// Show hit overlay quickly, then fade out
+		monsterHit.alpha = 0.6;
+		tween(monsterHit, {
+			alpha: 0
+		}, {
+			duration: 180,
+			easing: tween.linear
+		});
+		// Slight scale pop
+		tween.stop(monsterBody, {
+			scaleX: true,
+			scaleY: true
+		});
+		monsterBody.scaleX = 1.1;
+		monsterBody.scaleY = 1.1;
+		tween(monsterBody, {
+			scaleX: 1,
+			scaleY: 1
+		}, {
+			duration: 120,
+			easing: tween.easeOut
+		});
+	};
+	// Take damage
+	self.takeDamage = function (amount) {
+		self.health -= amount;
+		if (self.health < 0) self.health = 0;
+		self.updateHealthBar();
+		self.hitAnim();
+		LK.getSound('hit').play();
+	};
+	// Reset monster health
+	self.resetHealth = function (newMax) {
+		self.maxHealth = newMax;
+		self.health = self.maxHealth;
+		self.updateHealthBar();
+	};
+	// On tap/click
+	self.down = function (x, y, obj) {
+		self.takeDamage(1);
+	};
+	// Initialize health bar
+	self.updateHealthBar();
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x181818
+});
+
+/**** 
+* Game Code
+****/ 
+// Sound for hit
+// Health bar foreground: green box
+// Health bar background: gray box
+// Monster hit overlay: red ellipse, same size, for hit flash
+// Monster asset: a big green ellipse
+// Score
+var score = 0;
+// Score text
+var scoreTxt = new Text2('0', {
+	size: 120,
+	fill: "#fff"
+});
+scoreTxt.anchor.set(0.5, 0);
+// Place at top center, but not in top 100px (avoid menu)
+scoreTxt.y = 20;
+LK.gui.top.addChild(scoreTxt);
+// Center position for monster
+var centerX = 2048 / 2;
+var centerY = 2732 / 2;
+// Current monster
+var monster = null;
+// Function to spawn a new monster
+function spawnMonster() {
+	// Remove old monster if exists
+	if (monster) {
+		monster.destroy();
+		monster = null;
+	}
+	// Increase difficulty: every 10 monsters, +2 health
+	var baseHealth = 10 + Math.floor(score / 10) * 2;
+	monster = new Monster();
+	monster.x = centerX;
+	monster.y = centerY;
+	monster.resetHealth(baseHealth);
+	game.addChild(monster);
+}
+// Game update loop
+game.update = function () {
+	if (!monster) return;
+	// If monster is dead, increment score and spawn new
+	if (monster.health <= 0) {
+		score += 1;
+		scoreTxt.setText(score);
+		spawnMonster();
+	}
+};
+// Start first monster
+spawnMonster();
\ No newline at end of file