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

/**** 
* Classes
****/ 
var BigEnemyDrop = Container.expand(function () {
	var self = Container.call(this);
	var dropGraphics = self.attachAsset('bigEnemyDropAsset', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.pointValue = 50;
	self.collectRadius = 50;
	self.update = function () {
		var dx = player.x - self.x;
		var dy = player.y - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance < self.collectRadius) {
			var moveSpeed = 8;
			self.x += dx / distance * moveSpeed;
			self.y += dy / distance * moveSpeed;
			if (distance < 30) {
				LK.setScore(LK.getScore() + self.pointValue);
				self.destroy();
				for (var i = bigEnemyDrops.length - 1; i >= 0; i--) {
					if (bigEnemyDrops[i] === self) {
						bigEnemyDrops.splice(i, 1);
						break;
					}
				}
			}
		}
	};
	return self;
});
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.velocityX = 0;
	self.velocityY = 0;
	self.damage = 5;
	self.lifespan = 0;
	self.maxLifespan = 120;
	self.update = function () {
		if (powerUpActive) return;
		self.x += self.velocityX;
		self.y += self.velocityY;
		self.lifespan++;
		if (self.lifespan >= self.maxLifespan || self.x < -50 || self.x > 2098 || self.y < -50 || self.y > 2782) {
			self.destroy();
			for (var i = bullets.length - 1; i >= 0; i--) {
				if (bullets[i] === self) {
					bullets.splice(i, 1);
					break;
				}
			}
		}
	};
	return self;
});
var CircleBoss = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('uniqueCircleBoss', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.health = 80;
	self.maxHealth = 80;
	self.speed = 1.5;
	self.damage = 20;
	self.experienceValue = 2;
	self.shootTimer = 0;
	self.shootCooldown = 90;
	self.update = function () {
		if (powerUpActive) return;
		// Check if touching shield circle
		if (shieldActive && player.shieldCircle) {
			var dx = player.x - self.x;
			var dy = player.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance < 150) {
				// Shield circle radius
				self.die();
				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;
		}
		// Shooting logic
		self.shootTimer++;
		if (self.shootTimer >= self.shootCooldown && distance < 800 && distance > 100) {
			self.shootAtPlayer();
			self.shootTimer = 0;
		}
		if (distance < 50) {
			player.takeDamage(self.damage);
			self.destroy();
			for (var i = shieldEnemies.length - 1; i >= 0; i--) {
				if (shieldEnemies[i] === self) {
					shieldEnemies.splice(i, 1);
					break;
				}
			}
		}
	};
	self.shootAtPlayer = function () {
		var bullet = new EnemyBullet();
		bullet.x = self.x;
		bullet.y = self.y;
		var dx = player.x - self.x;
		var dy = player.y - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		bullet.velocityX = dx / distance * 8;
		bullet.velocityY = dy / distance * 8;
		enemyBullets.push(bullet);
		game.addChild(bullet);
	};
	self.takeDamage = function (damage) {
		self.health -= damage;
		LK.effects.flashObject(self, 0xFFFFFF, 100);
		if (self.health <= 0) {
			self.die();
		}
	};
	self.die = function () {
		var drop = new ShieldPowerup();
		drop.x = self.x;
		drop.y = self.y;
		shieldPowerups.push(drop);
		game.addChild(drop);
		LK.getSound('enemyHit').play();
		self.destroy();
		for (var i = shieldEnemies.length - 1; i >= 0; i--) {
			if (shieldEnemies[i] === self) {
				shieldEnemies.splice(i, 1);
				break;
			}
		}
	};
	return self;
});
var ClearBoss = Container.expand(function () {
	var self = Container.call(this);
	var bossGraphics = self.attachAsset('boss', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.health = 80;
	self.maxHealth = 80;
	self.speed = 1;
	self.damage = 30;
	self.experienceValue = 10;
	self.update = function () {
		if (powerUpActive) 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;
		}
		if (distance < 80) {
			player.takeDamage(self.damage);
		}
	};
	self.takeDamage = function (damage) {
		self.health -= damage;
		LK.effects.flashObject(self, 0xFFFFFF, 150);
		if (self.health <= 0) {
			self.die();
		}
	};
	self.die = function () {
		// Create big enemy drop
		var drop = new BigEnemyDrop();
		drop.x = self.x;
		drop.y = self.y;
		bigEnemyDrops.push(drop);
		game.addChild(drop);
		// Create screen clear powerup - all big enemies drop this
		var powerup = new ScreenClearPowerup();
		powerup.x = self.x;
		powerup.y = self.y;
		screenClearPowerups.push(powerup);
		game.addChild(powerup);
		// Visual feedback for powerup drop
		LK.effects.flashObject(powerup, 0xFF9800, 1000);
		LK.getSound('bossDefeat').play();
		// Remove from bosses array first, then destroy
		for (var i = bosses.length - 1; i >= 0; i--) {
			if (bosses[i] === self) {
				bosses.splice(i, 1);
				break;
			}
		}
		self.destroy();
	};
	return self;
});
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5,
		tint: 0xFF4444
	});
	self.velocityX = 0;
	self.velocityY = 0;
	self.damage = 10;
	self.lifespan = 0;
	self.maxLifespan = 120;
	self.update = function () {
		if (powerUpActive) return;
		self.x += self.velocityX;
		self.y += self.velocityY;
		self.lifespan++;
		if (self.lifespan >= self.maxLifespan || self.x < -50 || self.x > 2098 || self.y < -50 || self.y > 2782) {
			self.destroy();
			for (var i = enemyBullets.length - 1; i >= 0; i--) {
				if (enemyBullets[i] === self) {
					enemyBullets.splice(i, 1);
					break;
				}
			}
		}
		// Check collision with player
		var dx = player.x - self.x;
		var dy = player.y - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance < 40) {
			player.takeDamage(self.damage);
			self.destroy();
			for (var i = enemyBullets.length - 1; i >= 0; i--) {
				if (enemyBullets[i] === self) {
					enemyBullets.splice(i, 1);
					break;
				}
			}
		}
	};
	return self;
});
var ExperienceOrb = Container.expand(function () {
	var self = Container.call(this);
	var orbGraphics = self.attachAsset('experienceOrb', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.experienceValue = 1;
	self.collectRadius = 100;
	self.update = function () {
		var dx = player.x - self.x;
		var dy = player.y - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance < self.collectRadius) {
			var moveSpeed = 8;
			self.x += dx / distance * moveSpeed;
			self.y += dy / distance * moveSpeed;
			if (distance < 30) {
				player.gainExperience(self.experienceValue);
				self.destroy();
				for (var i = experienceOrbs.length - 1; i >= 0; i--) {
					if (experienceOrbs[i] === self) {
						experienceOrbs.splice(i, 1);
						break;
					}
				}
			}
		}
	};
	return self;
});
var Goblin = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.health = 10;
	self.maxHealth = 10;
	self.speed = 2;
	self.damage = 15;
	self.experienceValue = 1;
	self.update = function () {
		if (powerUpActive) return;
		// Check if touching shield circle
		if (shieldActive && player.shieldCircle) {
			var dx = player.x - self.x;
			var dy = player.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance < 250) {
				// Shield circle radius
				self.die();
				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;
		}
		if (distance < 50) {
			player.takeDamage(self.damage);
			self.destroy();
			for (var i = enemies.length - 1; i >= 0; i--) {
				if (enemies[i] === self) {
					enemies.splice(i, 1);
					break;
				}
			}
		}
	};
	self.takeDamage = function (damage) {
		self.health -= damage;
		LK.effects.flashObject(self, 0xFFFFFF, 100);
		if (self.health <= 0) {
			self.die();
		}
	};
	self.die = function () {
		var drop = new SmallEnemyDrop();
		drop.x = self.x;
		drop.y = self.y;
		smallEnemyDrops.push(drop);
		game.addChild(drop);
		LK.getSound('enemyHit').play();
		self.destroy();
		for (var i = enemies.length - 1; i >= 0; i--) {
			if (enemies[i] === self) {
				enemies.splice(i, 1);
				break;
			}
		}
	};
	return self;
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.health = 100;
	self.maxHealth = 100;
	self.experience = 0;
	self.level = 1;
	self.experienceToNext = 10;
	self.shootTimer = 0;
	self.shootCooldown = 30;
	self.damage = 5;
	self.speed = 8;
	self.update = function () {
		self.shootTimer++;
		if (self.shootTimer >= self.shootCooldown) {
			self.shootAtNearestEnemy();
			self.shootTimer = 0;
		}
	};
	self.shootAtNearestEnemy = function () {
		// Can't shoot when shield is active
		if (shieldActive) return;
		var nearestEnemy = null;
		var nearestDistance = Infinity;
		// Check regular enemies
		for (var i = 0; i < enemies.length; i++) {
			var enemy = enemies[i];
			var dx = enemy.x - self.x;
			var dy = enemy.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance < nearestDistance && distance < 600) {
				nearestDistance = distance;
				nearestEnemy = enemy;
			}
		}
		// Check bosses
		for (var i = 0; i < bosses.length; i++) {
			var boss = bosses[i];
			var dx = boss.x - self.x;
			var dy = boss.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance < nearestDistance && distance < 600) {
				nearestDistance = distance;
				nearestEnemy = boss;
			}
		}
		// Check shield enemies (CircleBoss)
		for (var i = 0; i < shieldEnemies.length; i++) {
			var shieldEnemy = shieldEnemies[i];
			var dx = shieldEnemy.x - self.x;
			var dy = shieldEnemy.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance < nearestDistance && distance < 600) {
				nearestDistance = distance;
				nearestEnemy = shieldEnemy;
			}
		}
		if (nearestEnemy) {
			for (var b = 0; b < bulletCount; b++) {
				var bullet = new Bullet();
				bullet.x = self.x;
				bullet.y = self.y;
				var dx = nearestEnemy.x - self.x;
				var dy = nearestEnemy.y - self.y;
				var distance = Math.sqrt(dx * dx + dy * dy);
				var spread = (b - (bulletCount - 1) / 2) * 0.2;
				var angle = Math.atan2(dy, dx) + spread;
				bullet.velocityX = Math.cos(angle) * 15;
				bullet.velocityY = Math.sin(angle) * 15;
				bullet.damage = self.damage + damageBonus;
				bullets.push(bullet);
				game.addChild(bullet);
			}
			LK.getSound('shoot').play();
		}
	};
	self.takeDamage = function (damage) {
		self.health -= damage;
		if (self.health <= 0) {
			self.health = 0;
			LK.showGameOver();
		}
		LK.effects.flashObject(self, 0xFF0000, 200);
	};
	self.gainExperience = function (amount) {
		self.experience += amount;
		if (self.experience >= self.experienceToNext) {
			self.levelUp();
		}
	};
	self.levelUp = function () {
		self.level++;
		self.experience = 0;
		self.experienceToNext = Math.floor(self.experienceToNext * 1.5);
		LK.getSound('levelUp').play();
	};
	return self;
});
var ScreenClearPowerup = Container.expand(function () {
	var self = Container.call(this);
	var powerupGraphics = self.attachAsset('screenClearPowerup', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.update = function () {
		var dx = player.x - self.x;
		var dy = player.y - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance < 40) {
			// Clear all enemies when powerup is collected
			for (var i = enemies.length - 1; i >= 0; i--) {
				var enemy = enemies[i];
				var drop = new SmallEnemyDrop();
				drop.x = enemy.x;
				drop.y = enemy.y;
				smallEnemyDrops.push(drop);
				game.addChild(drop);
				enemy.destroy();
				enemies.splice(i, 1);
			}
			// Clear all bosses
			for (var i = bosses.length - 1; i >= 0; i--) {
				var boss = bosses[i];
				var drop = new BigEnemyDrop();
				drop.x = boss.x;
				drop.y = boss.y;
				bigEnemyDrops.push(drop);
				game.addChild(drop);
				boss.destroy();
				bosses.splice(i, 1);
			}
			// Note: CircleBoss enemies in shieldEnemies array are not affected by screen clear
			LK.getSound('screenClear').play();
			LK.effects.flashScreen(0xFFFFFF, 500);
			self.destroy();
			for (var i = screenClearPowerups.length - 1; i >= 0; i--) {
				if (screenClearPowerups[i] === self) {
					screenClearPowerups.splice(i, 1);
					break;
				}
			}
		}
	};
	return self;
});
var ShieldPowerup = Container.expand(function () {
	var self = Container.call(this);
	var powerupGraphics = self.attachAsset('uniqueCircleBossDrop', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.update = function () {
		var dx = player.x - self.x;
		var dy = player.y - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance < 40) {
			// Activate shield
			activateShield();
			self.destroy();
			for (var i = shieldPowerups.length - 1; i >= 0; i--) {
				if (shieldPowerups[i] === self) {
					shieldPowerups.splice(i, 1);
					break;
				}
			}
		}
	};
	return self;
});
var SmallEnemyDrop = Container.expand(function () {
	var self = Container.call(this);
	var dropGraphics = self.attachAsset('experienceOrb', {
		anchorX: 0.5,
		anchorY: 0.5,
		tint: 0x00FF00
	});
	self.pointValue = 10;
	self.collectRadius = 50;
	self.update = function () {
		var dx = player.x - self.x;
		var dy = player.y - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance < self.collectRadius) {
			var moveSpeed = 8;
			self.x += dx / distance * moveSpeed;
			self.y += dy / distance * moveSpeed;
			if (distance < 30) {
				LK.setScore(LK.getScore() + self.pointValue);
				self.destroy();
				for (var i = smallEnemyDrops.length - 1; i >= 0; i--) {
					if (smallEnemyDrops[i] === self) {
						smallEnemyDrops.splice(i, 1);
						break;
					}
				}
			}
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2E2E2E
});

/**** 
* Game Code
****/ 
var player;
var enemies = [];
var bosses = [];
var bullets = [];
var enemyBullets = [];
var experienceOrbs = [];
var screenClearPowerups = [];
var smallEnemyDrops = [];
var bigEnemyDrops = [];
var shieldEnemies = [];
var shieldPowerups = [];
var shieldActive = false;
var shieldTimer = 0;
var shieldDuration = 300; // 5 seconds at 60fps
var enemySpawnTimer = 0;
var enemySpawnRate = 60;
var bossSpawnTimer = 0;
var bossSpawnInterval = 600;
var screenClearCharges = 0;
var dragNode = null;
var powerUpActive = false;
var powerUpUI = null;
var bulletCount = 1;
var fireRateBonus = 0;
var damageBonus = 0;
var powerUpsUsed = 0;
// UI Elements
var healthText = new Text2('Health: 100', {
	size: 40,
	fill: 0xFF4444
});
healthText.anchor.set(0, 0);
LK.gui.topLeft.addChild(healthText);
healthText.x = 120;
healthText.y = 20;
var levelText = new Text2('Level: 1', {
	size: 40,
	fill: 0x44FF44
});
levelText.anchor.set(0, 0);
LK.gui.topRight.addChild(levelText);
levelText.x = -200;
levelText.y = 20;
var scoreText = new Text2('0', {
	size: 50,
	fill: 0xFFFFFF
});
scoreText.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreText);
scoreText.y = 80;
function updateUI() {
	healthText.setText('Health: ' + player.health);
	levelText.setText('Level: ' + player.level);
	scoreText.setText(LK.getScore().toString());
}
function showPowerUpUI() {
	powerUpActive = true;
	powerUpUI = new Container();
	game.addChild(powerUpUI);
	var background = LK.getAsset('powerUpUIBackground', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 1024,
		y: 1366,
		alpha: 0.8
	});
	powerUpUI.addChild(background);
	var titleText = new Text2('POWER UP!', {
		size: 80,
		fill: 0xFFFFFF
	});
	titleText.anchor.set(0.5, 0.5);
	titleText.x = 1024;
	titleText.y = 1000;
	powerUpUI.addChild(titleText);
	var healthBtn = LK.getAsset('healthPowerUp', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 6,
		scaleY: 6,
		x: 700,
		y: 1366
	});
	powerUpUI.addChild(healthBtn);
	var healthText = new Text2('Health +10', {
		size: 50,
		fill: 0xFFFFFF
	});
	healthText.anchor.set(0.5, 0.5);
	healthText.x = 700;
	healthText.y = 1500;
	powerUpUI.addChild(healthText);
	var bulletBtn = LK.getAsset('addBulletPowerUp', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 6,
		scaleY: 6,
		x: 1024,
		y: 1366
	});
	if (bulletCount >= 10) {
		bulletBtn.alpha = 0.3;
	}
	powerUpUI.addChild(bulletBtn);
	var bulletText = new Text2(bulletCount >= 10 ? 'Max Bullets' : 'Add Bullet', {
		size: 50,
		fill: bulletCount >= 10 ? 0x888888 : 0xFFFFFF
	});
	bulletText.anchor.set(0.5, 0.5);
	bulletText.x = 1024;
	bulletText.y = 1500;
	powerUpUI.addChild(bulletText);
	var damageBtn = LK.getAsset('damagePowerUp', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 6,
		scaleY: 6,
		x: 1348,
		y: 1366
	});
	powerUpUI.addChild(damageBtn);
	var damageText = new Text2('Damage +5', {
		size: 50,
		fill: 0xFFFFFF
	});
	damageText.anchor.set(0.5, 0.5);
	damageText.x = 1348;
	damageText.y = 1500;
	powerUpUI.addChild(damageText);
	healthBtn.down = function () {
		applyPowerUp('health');
	};
	bulletBtn.down = function () {
		if (bulletCount < 10) {
			applyPowerUp('bullet');
		}
	};
	damageBtn.down = function () {
		applyPowerUp('damage');
	};
}
function applyPowerUp(type) {
	if (type === 'health') {
		player.health = Math.min(player.maxHealth, player.health + 10);
	} else if (type === 'bullet') {
		bulletCount += 1;
	} else if (type === 'damage') {
		damageBonus += 5;
	}
	powerUpsUsed++;
	tween(powerUpUI, {
		alpha: 0
	}, {
		duration: 300,
		onFinish: function onFinish() {
			if (powerUpUI) {
				powerUpUI.destroy();
				powerUpUI = null;
			}
			powerUpActive = false;
		}
	});
}
function spawnEnemy() {
	var enemy = new Goblin();
	var side = Math.floor(Math.random() * 4);
	if (side === 0) {
		// Top
		enemy.x = Math.random() * 2048;
		enemy.y = -50;
	} else if (side === 1) {
		// Right
		enemy.x = 2098;
		enemy.y = Math.random() * 2732;
	} else if (side === 2) {
		// Bottom
		enemy.x = Math.random() * 2048;
		enemy.y = 2782;
	} else {
		// Left
		enemy.x = -50;
		enemy.y = Math.random() * 2732;
	}
	enemies.push(enemy);
	game.addChild(enemy);
}
function spawnBoss() {
	var boss = new ClearBoss();
	var side = Math.floor(Math.random() * 4);
	if (side === 0) {
		// Top
		boss.x = Math.random() * 2048;
		boss.y = -75;
	} else if (side === 1) {
		// Right
		boss.x = 2048 + 75;
		boss.y = Math.random() * 2732;
	} else if (side === 2) {
		// Bottom
		boss.x = Math.random() * 2048;
		boss.y = 2732 + 75;
	} else {
		// Left
		boss.x = -75;
		boss.y = Math.random() * 2732;
	}
	bosses.push(boss);
	game.addChild(boss);
}
function activateShield() {
	shieldActive = true;
	shieldTimer = 0;
	// Create visual shield circle around player
	player.shieldCircle = LK.getAsset('shieldCircle', {
		anchorX: 0.5,
		anchorY: 0.5,
		alpha: 0.3
	});
	player.addChild(player.shieldCircle);
	// Animate shield appearance
	tween(player.shieldCircle, {
		alpha: 0.5,
		scaleX: 1.1,
		scaleY: 1.1
	}, {
		duration: 300,
		onFinish: function onFinish() {
			tween(player.shieldCircle, {
				scaleX: 1,
				scaleY: 1
			}, {
				duration: 200
			});
		}
	});
}
function spawnShieldEnemy() {
	var enemy = new CircleBoss();
	var side = Math.floor(Math.random() * 4);
	if (side === 0) {
		enemy.x = Math.random() * 2048;
		enemy.y = -50;
	} else if (side === 1) {
		enemy.x = 2098;
		enemy.y = Math.random() * 2732;
	} else if (side === 2) {
		enemy.x = Math.random() * 2048;
		enemy.y = 2782;
	} else {
		enemy.x = -50;
		enemy.y = Math.random() * 2732;
	}
	shieldEnemies.push(enemy);
	game.addChild(enemy);
}
function useScreenClear() {
	if (screenClearCharges > 0) {
		screenClearCharges--;
		LK.getSound('screenClear').play();
		LK.effects.flashScreen(0xFFFFFF, 500);
		// Clear all enemies
		for (var i = enemies.length - 1; i >= 0; i--) {
			var enemy = enemies[i];
			var drop = new SmallEnemyDrop();
			drop.x = enemy.x;
			drop.y = enemy.y;
			smallEnemyDrops.push(drop);
			game.addChild(drop);
			enemy.destroy();
			enemies.splice(i, 1);
		}
		// Clear all bosses
		for (var i = bosses.length - 1; i >= 0; i--) {
			var boss = bosses[i];
			var drop = new BigEnemyDrop();
			drop.x = boss.x;
			drop.y = boss.y;
			bigEnemyDrops.push(drop);
			game.addChild(drop);
			boss.destroy();
			bosses.splice(i, 1);
		}
		// Note: CircleBoss enemies in shieldEnemies array are not affected by screen clear
	}
}
// Add background
var background = LK.getAsset('backgroundAsset', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 0
});
game.addChild(background);
// Initialize player
player = new Player();
player.x = 1024;
player.y = 1366;
game.addChild(player);
function handleMove(x, y, obj) {
	if (dragNode) {
		dragNode.x = x;
		dragNode.y = y;
		// Keep player within bounds
		dragNode.x = Math.max(40, Math.min(2008, dragNode.x));
		dragNode.y = Math.max(40, Math.min(2692, dragNode.y));
	}
}
game.move = handleMove;
game.down = function (x, y, obj) {
	// Check if clicking screen clear button area
	if (y < 150 && Math.abs(x - 1024) < 200) {
		useScreenClear();
	} else {
		dragNode = player;
		handleMove(x, y, obj);
	}
};
game.up = function (x, y, obj) {
	dragNode = null;
};
game.update = function () {
	// Update all game objects
	player.update();
	if (!powerUpActive) {
		for (var i = bullets.length - 1; i >= 0; i--) {
			bullets[i].update();
		}
	}
	if (!powerUpActive) {
		for (var i = enemies.length - 1; i >= 0; i--) {
			enemies[i].update();
		}
	}
	if (!powerUpActive) {
		for (var i = bosses.length - 1; i >= 0; i--) {
			bosses[i].update();
		}
	}
	for (var i = experienceOrbs.length - 1; i >= 0; i--) {
		experienceOrbs[i].update();
	}
	for (var i = screenClearPowerups.length - 1; i >= 0; i--) {
		screenClearPowerups[i].update();
	}
	for (var i = smallEnemyDrops.length - 1; i >= 0; i--) {
		smallEnemyDrops[i].update();
	}
	for (var i = bigEnemyDrops.length - 1; i >= 0; i--) {
		bigEnemyDrops[i].update();
	}
	for (var i = shieldEnemies.length - 1; i >= 0; i--) {
		shieldEnemies[i].update();
	}
	for (var i = shieldPowerups.length - 1; i >= 0; i--) {
		shieldPowerups[i].update();
	}
	for (var i = enemyBullets.length - 1; i >= 0; i--) {
		enemyBullets[i].update();
	}
	// Handle shield timer
	if (shieldActive) {
		shieldTimer++;
		if (shieldTimer >= shieldDuration) {
			// Deactivate shield
			shieldActive = false;
			shieldTimer = 0;
			if (player.shieldCircle) {
				tween(player.shieldCircle, {
					alpha: 0
				}, {
					duration: 300,
					onFinish: function onFinish() {
						player.shieldCircle.destroy();
						player.shieldCircle = null;
					}
				});
			}
		}
	}
	// Bullet collision with enemies
	for (var i = bullets.length - 1; i >= 0; i--) {
		var bullet = bullets[i];
		for (var j = enemies.length - 1; j >= 0; j--) {
			var enemy = enemies[j];
			if (bullet.intersects(enemy)) {
				enemy.takeDamage(bullet.damage);
				bullet.destroy();
				bullets.splice(i, 1);
				break;
			}
		}
		if (bullets[i]) {
			for (var j = bosses.length - 1; j >= 0; j--) {
				var boss = bosses[j];
				if (bullet.intersects(boss)) {
					boss.takeDamage(bullet.damage);
					bullet.destroy();
					bullets.splice(i, 1);
					break;
				}
			}
		}
		// Bullet collision with shield enemies
		if (bullets[i]) {
			for (var j = shieldEnemies.length - 1; j >= 0; j--) {
				var shieldEnemy = shieldEnemies[j];
				if (bullet.intersects(shieldEnemy)) {
					shieldEnemy.takeDamage(bullet.damage);
					bullet.destroy();
					bullets.splice(i, 1);
					break;
				}
			}
		}
	}
	// Spawn enemies
	enemySpawnTimer++;
	if (enemySpawnTimer >= enemySpawnRate) {
		spawnEnemy();
		enemySpawnTimer = 0;
		// Increase spawn rate over time
		if (enemySpawnRate > 20) {
			enemySpawnRate = Math.max(20, enemySpawnRate - 0.1);
		}
	}
	// Spawn bosses
	bossSpawnTimer++;
	if (bossSpawnTimer >= bossSpawnInterval && bosses.length === 0) {
		spawnBoss();
		bossSpawnTimer = 0;
	}
	// Spawn shield enemies occasionally
	if (LK.ticks % 900 === 0 && shieldEnemies.length < 2) {
		// Every 15 seconds, but only if less than 2 CircleBoss on screen
		spawnShieldEnemy();
	}
	// Check for power up every 500 points
	var nextPowerUpThreshold = (powerUpsUsed + 1) * 500;
	if (LK.getScore() >= nextPowerUpThreshold && !powerUpActive) {
		showPowerUpUI();
	}
	updateUI();
};

===================================================================
--- original.js
+++ change.js
@@ -992,10 +992,10 @@
 		spawnBoss();
 		bossSpawnTimer = 0;
 	}
 	// Spawn shield enemies occasionally
-	if (LK.ticks % 900 === 0) {
-		// Every 15 seconds
+	if (LK.ticks % 900 === 0 && shieldEnemies.length < 2) {
+		// Every 15 seconds, but only if less than 2 CircleBoss on screen
 		spawnShieldEnemy();
 	}
 	// Check for power up every 500 points
 	var nextPowerUpThreshold = (powerUpsUsed + 1) * 500;