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

/**** 
* Classes
****/ 
var BloodSplat = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('blood', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.lifetime = 600; // 10 seconds at 60fps
	self.fadeStartTime = 0;
	self.isFading = false;
	self.update = function () {
		self.lifetime--;
		// Start fading after 10 seconds
		if (self.lifetime <= 0 && !self.isFading) {
			self.isFading = true;
			tween(graphics, {
				alpha: 0
			}, {
				duration: 3000,
				onFinish: function onFinish() {
					self.destroy();
				}
			});
		}
	};
	return self;
});
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 20;
	self.dx = 0;
	self.dy = 0;
	self.active = true;
	self.update = function () {
		if (!self.active) return;
		self.x += self.dx;
		self.y += self.dy;
		if (self.x < -50 || self.x > 2098 || self.y < -50 || self.y > 2782) {
			self.active = false;
		}
	};
	self.setDirection = function (targetX, targetY) {
		var dx = targetX - self.x;
		var dy = targetY - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance > 0) {
			self.dx = dx / distance * self.speed;
			self.dy = dy / distance * self.speed;
			// Rotate bullet to face direction of travel
			graphics.rotation = Math.atan2(dy, dx) + Math.PI / 2;
		}
	};
	return self;
});
var Monster = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('monster', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 2;
	self.health = 1;
	self.damage = 10;
	self.active = true;
	self.lastPlayerDistance = 0;
	self.update = function () {
		if (!self.active) return;
		var dx = player.x - self.x;
		var dy = player.y - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance > 0) {
			self.x += dx / distance * self.speed;
			self.y += dy / distance * self.speed;
			// Rotate monster to face the player
			graphics.rotation = Math.atan2(dy, dx) + Math.PI / 2;
		}
		var currentDistance = distance;
		if (self.lastPlayerDistance > 50 && currentDistance <= 50) {
			player.takeDamage(self.damage);
			self.active = false;
		}
		self.lastPlayerDistance = currentDistance;
	};
	self.takeDamage = function (damage) {
		self.health -= damage;
		if (self.health <= 0) {
			self.active = false;
			// Create blood explosion
			for (var i = 0; i < 8; i++) {
				var bloodSplat = new BloodSplat();
				bloodSplat.x = self.x + (Math.random() - 0.5) * 100;
				bloodSplat.y = self.y + (Math.random() - 0.5) * 100;
				bloodSplat.graphics = bloodSplat.children[0];
				var scale = 0.5 + Math.random() * 1.5;
				bloodSplat.graphics.scaleX = scale;
				bloodSplat.graphics.scaleY = scale;
				bloodSplats.push(bloodSplat);
				game.addChild(bloodSplat);
			}
			LK.setScore(LK.getScore() + 10);
			LK.getSound('hit').play();
			return true;
		}
		return false;
	};
	return self;
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.health = 100;
	self.maxHealth = 100;
	self.fireRate = 8;
	self.fireTimer = 0;
	self.update = function () {
		if (self.fireTimer > 0) {
			self.fireTimer--;
		}
	};
	self.takeDamage = function (damage) {
		self.health -= damage;
		if (self.health <= 0) {
			self.health = 0;
			LK.showGameOver();
		}
		LK.effects.flashObject(self, 0xff0000, 300);
	};
	self.canFire = function () {
		return self.fireTimer <= 0;
	};
	self.fire = function () {
		if (self.canFire()) {
			self.fireTimer = self.fireRate;
			return true;
		}
		return false;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2c3e50
});

/**** 
* Game Code
****/ 
var player = null;
var bullets = [];
var monsters = [];
var bloodSplats = [];
var waveNumber = 1;
var monstersInWave = 5;
var monstersSpawned = 0;
var monstersKilled = 0;
var spawnTimer = 0;
var waveDelay = 180;
var bulletCooldown = 0;
var scoreText = new Text2('Score: 0', {
	size: 60,
	fill: 0xFFFFFF
});
scoreText.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreText);
var healthText = new Text2('Health: 100', {
	size: 50,
	fill: 0xFF4444
});
healthText.anchor.set(0, 0);
healthText.x = 120;
healthText.y = 20;
LK.gui.topLeft.addChild(healthText);
var waveText = new Text2('Wave: 1', {
	size: 50,
	fill: 0x4A90E2
});
waveText.anchor.set(1, 0);
LK.gui.topRight.addChild(waveText);
player = game.addChild(new Player());
player.x = 1024;
player.y = 1366;
function spawnMonster() {
	if (monstersSpawned >= monstersInWave) return;
	var monster = new Monster();
	var side = Math.floor(Math.random() * 4);
	switch (side) {
		case 0:
			// Top
			monster.x = Math.random() * 2048;
			monster.y = -30;
			break;
		case 1:
			// Right
			monster.x = 2078;
			monster.y = Math.random() * 2732;
			break;
		case 2:
			// Bottom
			monster.x = Math.random() * 2048;
			monster.y = 2762;
			break;
		case 3:
			// Left
			monster.x = -30;
			monster.y = Math.random() * 2732;
			break;
	}
	monster.speed = 1.5 + waveNumber * 0.3;
	monsters.push(monster);
	game.addChild(monster);
	monstersSpawned++;
}
function cleanupBullets() {
	for (var i = bullets.length - 1; i >= 0; i--) {
		var bullet = bullets[i];
		if (!bullet.active) {
			bullet.destroy();
			bullets.splice(i, 1);
		}
	}
}
function cleanupMonsters() {
	for (var i = monsters.length - 1; i >= 0; i--) {
		var monster = monsters[i];
		if (!monster.active) {
			monster.destroy();
			monsters.splice(i, 1);
			monstersKilled++;
		}
	}
}
function cleanupBloodSplats() {
	for (var i = bloodSplats.length - 1; i >= 0; i--) {
		var bloodSplat = bloodSplats[i];
		if (!bloodSplat.parent) {
			bloodSplats.splice(i, 1);
		}
	}
}
function checkBulletCollisions() {
	for (var i = 0; i < bullets.length; i++) {
		var bullet = bullets[i];
		if (!bullet.active) continue;
		for (var j = 0; j < monsters.length; j++) {
			var monster = monsters[j];
			if (!monster.active) continue;
			if (bullet.intersects(monster)) {
				bullet.active = false;
				monster.takeDamage(1);
				break;
			}
		}
	}
}
function nextWave() {
	waveNumber++;
	monstersInWave = 5 + waveNumber * 2;
	monstersSpawned = 0;
	monstersKilled = 0;
	spawnTimer = 0;
	waveDelay = 180;
	waveText.setText('Wave: ' + waveNumber);
}
game.down = function (x, y, obj) {
	if (bulletCooldown <= 0 && player.fire()) {
		var bullet = new Bullet();
		bullet.x = player.x;
		bullet.y = player.y;
		bullet.setDirection(x, y);
		bullets.push(bullet);
		game.addChild(bullet);
		LK.getSound('shoot').play();
		bulletCooldown = 30;
	}
};
game.update = function () {
	if (bulletCooldown > 0) {
		bulletCooldown--;
	}
	if (waveDelay > 0) {
		waveDelay--;
		return;
	}
	spawnTimer++;
	if (spawnTimer >= 60 && monstersSpawned < monstersInWave) {
		spawnMonster();
		spawnTimer = 0;
	}
	checkBulletCollisions();
	cleanupBullets();
	cleanupMonsters();
	cleanupBloodSplats();
	if (monstersKilled >= monstersInWave && monsters.length === 0) {
		nextWave();
	}
	scoreText.setText('Score: ' + LK.getScore());
	healthText.setText('Health: ' + player.health);
};

===================================================================
--- original.js
+++ change.js
@@ -5,8 +5,34 @@
 
 /**** 
 * Classes
 ****/ 
+var BloodSplat = Container.expand(function () {
+	var self = Container.call(this);
+	var graphics = self.attachAsset('blood', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.lifetime = 600; // 10 seconds at 60fps
+	self.fadeStartTime = 0;
+	self.isFading = false;
+	self.update = function () {
+		self.lifetime--;
+		// Start fading after 10 seconds
+		if (self.lifetime <= 0 && !self.isFading) {
+			self.isFading = true;
+			tween(graphics, {
+				alpha: 0
+			}, {
+				duration: 3000,
+				onFinish: function onFinish() {
+					self.destroy();
+				}
+			});
+		}
+	};
+	return self;
+});
 var Bullet = Container.expand(function () {
 	var self = Container.call(this);
 	var graphics = self.attachAsset('bullet', {
 		anchorX: 0.5,
@@ -69,8 +95,20 @@
 	self.takeDamage = function (damage) {
 		self.health -= damage;
 		if (self.health <= 0) {
 			self.active = false;
+			// Create blood explosion
+			for (var i = 0; i < 8; i++) {
+				var bloodSplat = new BloodSplat();
+				bloodSplat.x = self.x + (Math.random() - 0.5) * 100;
+				bloodSplat.y = self.y + (Math.random() - 0.5) * 100;
+				bloodSplat.graphics = bloodSplat.children[0];
+				var scale = 0.5 + Math.random() * 1.5;
+				bloodSplat.graphics.scaleX = scale;
+				bloodSplat.graphics.scaleY = scale;
+				bloodSplats.push(bloodSplat);
+				game.addChild(bloodSplat);
+			}
 			LK.setScore(LK.getScore() + 10);
 			LK.getSound('hit').play();
 			return true;
 		}
@@ -126,8 +164,9 @@
 ****/ 
 var player = null;
 var bullets = [];
 var monsters = [];
+var bloodSplats = [];
 var waveNumber = 1;
 var monstersInWave = 5;
 var monstersSpawned = 0;
 var monstersKilled = 0;
@@ -206,8 +245,16 @@
 			monstersKilled++;
 		}
 	}
 }
+function cleanupBloodSplats() {
+	for (var i = bloodSplats.length - 1; i >= 0; i--) {
+		var bloodSplat = bloodSplats[i];
+		if (!bloodSplat.parent) {
+			bloodSplats.splice(i, 1);
+		}
+	}
+}
 function checkBulletCollisions() {
 	for (var i = 0; i < bullets.length; i++) {
 		var bullet = bullets[i];
 		if (!bullet.active) continue;
@@ -258,8 +305,9 @@
 	}
 	checkBulletCollisions();
 	cleanupBullets();
 	cleanupMonsters();
+	cleanupBloodSplats();
 	if (monstersKilled >= monstersInWave && monsters.length === 0) {
 		nextWave();
 	}
 	scoreText.setText('Score: ' + LK.getScore());