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

/**** 
* Classes
****/ 
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('attackEffect', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	bulletGraphics.scaleX = 0.5;
	bulletGraphics.scaleY = 0.5;
	// Set bullet speed based on boost status
	self.speed = bulletSpeedBoostTimer > 0 ? baseBulletSpeed * 1.5 : baseBulletSpeed;
	self.targetX = 0;
	self.targetY = 0;
	self.damage = 0;
	self.isPlayerBullet = true;
	self.targetEnemy = null; // Specific enemy this bullet is targeting
	self.update = function () {
		// Check for direct collision with enemies/player regardless of distance
		if (self.isPlayerBullet) {
			// Only check collision with the specific target enemy
			if (self.targetEnemy && !self.targetEnemy.isRespawning && !self.targetEnemy.destroyed && self.intersects(self.targetEnemy)) {
				self.targetEnemy.takeDamage(self.damage);
				self.destroy();
				return;
			}
		} else {
			// Enemy bullet hitting player
			if (!player.isRespawning && self.intersects(player)) {
				player.takeDamage(self.damage);
				self.destroy();
				return;
			}
		}
		var dx = self.targetX - self.x;
		var dy = self.targetY - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		// If reached target position, destroy bullet
		if (distance < self.speed) {
			self.destroy();
			return;
		}
		// Move towards target
		var moveX = dx / distance * self.speed;
		var moveY = dy / distance * self.speed;
		self.x += moveX;
		self.y += moveY;
		// Remove if out of bounds
		if (self.x < 0 || self.x > 2048 || self.y < 0 || self.y > 2732) {
			self.destroy();
		}
	};
	return self;
});
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var healthBarBg = self.attachAsset('healthBarBg', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 0,
		y: -60
	});
	var healthBar = self.attachAsset('healthBar', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 0,
		y: -60
	});
	self.maxHealth = 100;
	self.health = 100;
	self.speed = 2;
	self.attackRange = 120;
	self.attackDamage = 5;
	self.attackCooldown = 0;
	self.isRespawning = false;
	self.respawnTimer = 0;
	self.aiTimer = 0;
	self.spawnImmunityTimer = 0; // Prevents attacking immediately after spawn
	self.targetX = 0;
	self.targetY = 0;
	self.takeDamage = function (damage) {
		if (self.isRespawning || self.health <= 0) return; // Don't take damage if already dead
		// Each bullet hit reduces health by 50% of max health
		self.health -= self.maxHealth * 0.5;
		if (self.health < 0) self.health = 0;
		self.updateHealthBar();
		// Flash red when taking damage
		tween(enemyGraphics, {
			tint: 0xFF0000
		}, {
			duration: 200,
			onFinish: function onFinish() {
				tween(enemyGraphics, {
					tint: 0xFFFFFF
				}, {
					duration: 200
				});
			}
		});
		if (self.health <= 0) {
			self.die();
		}
		LK.getSound('hit').play();
	};
	self.updateHealthBar = function () {
		var healthPercent = self.health / self.maxHealth;
		healthBar.scaleX = healthPercent;
		if (healthPercent > 0.6) {
			healthBar.tint = 0x00FF00;
		} else if (healthPercent > 0.3) {
			healthBar.tint = 0xFFFF00;
		} else {
			healthBar.tint = 0xFF0000;
		}
	};
	self.die = function () {
		self.isRespawning = true;
		self.respawnTimer = 180; // 3 seconds at 60fps
		enemyGraphics.visible = false;
		healthBar.visible = false;
		healthBarBg.visible = false;
		// Increment killed count and spawn new enemy only if under limit
		enemiesKilled++;
		score++;
		scoreText.setText('Score: ' + score);
		if (enemies.length < maxEnemies) {
			spawnNewEnemy();
		}
	};
	self.respawn = function () {
		self.health = self.maxHealth;
		self.isRespawning = false;
		self.respawnTimer = 0;
		enemyGraphics.visible = true;
		enemyGraphics.alpha = 1;
		healthBar.visible = true;
		healthBarBg.visible = true;
		self.updateHealthBar();
		// Respawn at random position
		self.x = 300 + Math.random() * 1400;
		self.y = 400 + Math.random() * 1800;
		LK.getSound('respawn').play();
	};
	self.attack = function () {
		if (self.attackCooldown > 0 || self.isRespawning || self.spawnImmunityTimer > 0) return;
		self.attackCooldown = 120; // 2 second cooldown
		if (!player.isRespawning) {
			// Create bullet projectile towards player
			var bullet = game.addChild(new Bullet());
			bullet.x = self.x;
			bullet.y = self.y;
			bullet.targetX = player.x;
			bullet.targetY = player.y;
			bullet.damage = self.attackDamage;
			bullet.isPlayerBullet = false;
			bullets.push(bullet);
		}
		// Create attack effect
		var attackEffect = LK.getAsset('attackEffect', {
			anchorX: 0.5,
			anchorY: 0.5
		});
		attackEffect.x = self.x;
		attackEffect.y = self.y;
		attackEffect.alpha = 0.7;
		attackEffect.tint = 0xFF4444;
		attackEffect.scaleX = 0.8;
		attackEffect.scaleY = 0.8;
		game.addChild(attackEffect);
		// Scale and fade out attack effect
		tween(attackEffect, {
			scaleX: 1.2,
			scaleY: 1.2,
			alpha: 0
		}, {
			duration: 200,
			onFinish: function onFinish() {
				attackEffect.destroy();
			}
		});
		LK.getSound('attack').play();
	};
	self.update = function () {
		if (self.attackCooldown > 0) {
			self.attackCooldown--;
		}
		if (self.spawnImmunityTimer > 0) {
			self.spawnImmunityTimer--;
			// Flash during spawn immunity period
			if (self.spawnImmunityTimer % 10 < 5) {
				enemyGraphics.alpha = 0.7;
			} else {
				enemyGraphics.alpha = 1;
			}
		}
		if (self.isRespawning) {
			self.respawnTimer--;
			if (self.respawnTimer <= 0) {
				self.respawn();
			}
			return;
		}
		// Chase player AI - move towards player and attack when close
		if (!player.isRespawning) {
			var dx = player.x - self.x;
			var dy = player.y - self.y;
			var playerDistance = Math.sqrt(dx * dx + dy * dy);
			// Move towards player with speed multiplier
			var currentSpeed = self.speed * enemySpeedMultiplier;
			if (playerDistance > currentSpeed) {
				// Add random movement offset to make enemies approach from different angles
				// Update AI timer for random movement changes
				self.aiTimer++;
				if (self.aiTimer >= 60) {
					// Change direction every second
					self.aiTimer = 0;
					// Generate random offset angle (-30 to +30 degrees)
					var offsetAngle = (Math.random() - 0.5) * Math.PI / 3; // ±30 degrees in radians
					var baseAngle = Math.atan2(dy, dx);
					var newAngle = baseAngle + offsetAngle;
					var moveX = Math.cos(newAngle) * currentSpeed;
					var moveY = Math.sin(newAngle) * currentSpeed;
				} else {
					// Use stored movement direction
					var moveX = dx / playerDistance * currentSpeed;
					var moveY = dy / playerDistance * currentSpeed;
				}
				self.x += moveX;
				self.y += moveY;
			}
			// Attack if close enough to player
			if (playerDistance <= self.attackRange) {
				self.attack();
			}
		}
		// Check collision with other enemies and push away if overlapping
		for (var e = 0; e < enemies.length; e++) {
			var otherEnemy = enemies[e];
			if (otherEnemy !== self && !otherEnemy.isRespawning && !self.isRespawning) {
				var dx = otherEnemy.x - self.x;
				var dy = otherEnemy.y - self.y;
				var distance = Math.sqrt(dx * dx + dy * dy);
				var minDistance = 150; // Increased minimum distance between enemies
				if (distance < minDistance && distance > 0) {
					// Calculate push direction (away from other enemy) with stronger force
					var pushStrength = (minDistance - distance) * 1.2; // Increased push strength
					var pushX = -(dx / distance) * pushStrength;
					var pushY = -(dy / distance) * pushStrength;
					// Apply push force
					self.x += pushX;
					self.y += pushY;
					// Also apply counter-force to the other enemy for better separation
					otherEnemy.x += dx / distance * pushStrength * 0.5;
					otherEnemy.y += dy / distance * pushStrength * 0.5;
				}
			}
		}
		// Keep enemy in bounds
		if (self.x < 150) self.x = 150;
		if (self.x > 1898) self.x = 1898;
		if (self.y < 150) self.y = 150;
		if (self.y > 2582) self.y = 2582;
	};
	return self;
});
var HealthPack = Container.expand(function () {
	var self = Container.call(this);
	var healthPackGraphics = self.attachAsset('healthPack', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.healAmount = 150; // Heal amount (50% of max health)
	self.lifetime = 600; // 10 seconds at 60fps
	// Pulse animation for visibility
	var pulseDirection = 1;
	var pulseSpeed = 0.02;
	self.update = function () {
		// Pulse animation
		healthPackGraphics.scaleX += pulseDirection * pulseSpeed;
		healthPackGraphics.scaleY += pulseDirection * pulseSpeed;
		if (healthPackGraphics.scaleX > 1.3 || healthPackGraphics.scaleX < 0.8) {
			pulseDirection *= -1;
		}
		// Reduce lifetime
		self.lifetime--;
		if (self.lifetime <= 0) {
			self.destroy();
		}
		// Check collision with player
		if (!player.isRespawning && self.intersects(player)) {
			// Heal player
			var oldHealth = player.health;
			player.health = Math.min(player.maxHealth, player.health + self.healAmount);
			player.updateHealthBar();
			// Give immunity for 2 seconds
			player.immunityTimer = 120;
			// Increase bullet speed for 3 seconds
			bulletSpeedBoostTimer = 180; // 3 seconds at 60fps
			// Visual effect
			tween(healthPackGraphics, {
				scaleX: 2,
				scaleY: 2,
				alpha: 0
			}, {
				duration: 300,
				onFinish: function onFinish() {
					self.destroy();
				}
			});
			LK.getSound('heal').play();
		}
	};
	return self;
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var healthBarBg = self.attachAsset('healthBarBg', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 0,
		y: -60
	});
	var healthBar = self.attachAsset('healthBar', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 0,
		y: -60
	});
	self.maxHealth = 100;
	self.health = 100;
	self.speed = 8;
	self.attackRange = 100;
	self.attackDamage = 25;
	self.attackCooldown = 0;
	self.isRespawning = false;
	self.respawnTimer = 0;
	self.immunityTimer = 0; // Immunity period after respawn
	self.takeDamage = function (damage, source) {
		if (self.isRespawning || self.immunityTimer > 0) return;
		// Prevent damage from explosions and enemy spawning
		if (source === 'explosion' || source === 'spawn') {
			return;
		}
		self.health -= damage;
		if (self.health < 0) self.health = 0;
		self.updateHealthBar();
		// Flash red when taking damage
		tween(playerGraphics, {
			tint: 0xFF0000
		}, {
			duration: 200,
			onFinish: function onFinish() {
				tween(playerGraphics, {
					tint: 0xFFFFFF
				}, {
					duration: 200
				});
			}
		});
		if (self.health <= 0) {
			self.die();
		}
		LK.getSound('hit').play();
	};
	self.updateHealthBar = function () {
		var healthPercent = self.health / self.maxHealth;
		healthBar.scaleX = healthPercent;
		if (healthPercent > 0.6) {
			healthBar.tint = 0x00FF00;
		} else if (healthPercent > 0.3) {
			healthBar.tint = 0xFFFF00;
		} else {
			healthBar.tint = 0xFF0000;
		}
	};
	self.die = function () {
		self.isRespawning = true;
		self.respawnTimer = 180; // 3 seconds at 60fps
		playerGraphics.alpha = 0.3;
		healthBar.visible = false;
		healthBarBg.visible = false;
		// Reset score when player dies
		score = 0;
		scoreText.setText('Score: ' + score);
		// Reset difficulty scaling
		difficultyLevel = 0;
		lastDifficultyScore = 0;
		enemySpeedMultiplier = 1.0; // Reset speed multiplier
		// Reset map - clear all enemies
		for (var i = enemies.length - 1; i >= 0; i--) {
			enemies[i].destroy();
		}
		enemies = [];
		// Clear all bullets
		for (var i = bullets.length - 1; i >= 0; i--) {
			bullets[i].destroy();
		}
		bullets = [];
		// Clear all health packs
		for (var i = healthPacks.length - 1; i >= 0; i--) {
			healthPacks[i].destroy();
		}
		healthPacks = [];
		// Reset other game state
		enemiesKilled = 0;
		bulletSpeedBoostTimer = 0;
		lastHealthPackSpawn = 0;
		fireRateBoostLevel = 0; // Reset fire rate progression
	};
	self.respawn = function () {
		self.health = self.maxHealth;
		self.isRespawning = false;
		self.respawnTimer = 0;
		playerGraphics.alpha = 1;
		healthBar.visible = true;
		healthBarBg.visible = true;
		self.updateHealthBar();
		// Respawn at center position since map is reset
		self.x = 500;
		self.y = 1000;
		// Add brief immunity period after respawn
		self.immunityTimer = 180; // 3 seconds of immunity
		// Spawn initial enemies after map reset
		for (var i = 0; i < 3; i++) {
			spawnNewEnemy();
		}
		LK.getSound('respawn').play();
	};
	self.attack = function () {
		if (self.attackCooldown > 0 || self.isRespawning) return;
		// Fire rate proportional to enemy count - more enemies = faster firing
		var activeEnemies = 0;
		for (var e = 0; e < enemies.length; e++) {
			if (!enemies[e].isRespawning) activeEnemies++;
		}
		var dynamicFireRate = Math.max(45, baseFireRate - activeEnemies * 5); // Slower firing with higher minimum
		// Apply fire rate boost - reduce cooldown by 5 frames per boost level (max 50% reduction)
		var fireRateReduction = Math.min(fireRateBoostLevel * 5, dynamicFireRate * 0.5);
		self.attackCooldown = dynamicFireRate - fireRateReduction;
		// Find closest enemy
		var closestEnemy = null;
		var closestDistance = Infinity;
		for (var i = 0; i < enemies.length; i++) {
			if (!enemies[i].isRespawning) {
				var distance = Math.sqrt(Math.pow(enemies[i].x - self.x, 2) + Math.pow(enemies[i].y - self.y, 2));
				if (distance < closestDistance) {
					closestDistance = distance;
					closestEnemy = enemies[i];
				}
			}
		}
		if (closestEnemy) {
			// Create bullet projectile
			var bullet = game.addChild(new Bullet());
			bullet.x = self.x;
			bullet.y = self.y;
			bullet.targetX = closestEnemy.x;
			bullet.targetY = closestEnemy.y;
			bullet.damage = self.attackDamage;
			bullet.isPlayerBullet = true;
			bullet.targetEnemy = closestEnemy; // Set specific target enemy
			bullets.push(bullet);
			// Create muzzle flash effect
			var attackEffect = LK.getAsset('attackEffect', {
				anchorX: 0.5,
				anchorY: 0.5
			});
			attackEffect.x = self.x;
			attackEffect.y = self.y;
			attackEffect.alpha = 0.7;
			attackEffect.tint = 0x4499FF;
			attackEffect.scaleX = 0.8;
			attackEffect.scaleY = 0.8;
			game.addChild(attackEffect);
			// Scale and fade out attack effect
			tween(attackEffect, {
				scaleX: 1.2,
				scaleY: 1.2,
				alpha: 0
			}, {
				duration: 200,
				onFinish: function onFinish() {
					attackEffect.destroy();
				}
			});
			LK.getSound('attack').play();
		}
	};
	self.update = function () {
		if (self.attackCooldown > 0) {
			self.attackCooldown--;
		}
		if (self.immunityTimer > 0) {
			self.immunityTimer--;
			// Flash during immunity period
			if (self.immunityTimer % 10 < 5) {
				playerGraphics.alpha = 0.5;
			} else {
				playerGraphics.alpha = 1;
			}
		}
		if (self.isRespawning) {
			self.respawnTimer--;
			if (self.respawnTimer <= 0) {
				self.respawn();
			}
			return;
		}
		// Auto-attack enemies regardless of distance
		if (self.attackCooldown <= 0) {
			for (var i = 0; i < enemies.length; i++) {
				var enemy = enemies[i];
				if (!enemy.isRespawning) {
					self.attack();
					break; // Only attack one enemy per frame
				}
			}
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2C3E50
});

/**** 
* Game Code
****/ 
// Create arena background
var arena = game.addChild(LK.getAsset('arena', {
	anchorX: 0.5,
	anchorY: 0.5
}));
arena.x = 2048 / 2;
arena.y = 2732 / 2;
// Game variables
var player;
var enemies = [];
var bullets = [];
var moveUp = false;
var moveDown = false;
var moveLeft = false;
var moveRight = false;
var targetX = 0;
var targetY = 0;
var isMovingToTarget = false;
var enemiesKilled = 0;
var score = 0;
var baseFireRate = 90; // Base attack cooldown - slower firing
var currentFireRate = 60;
var fireRateBoostLevel = 0; // Tracks fire rate improvements
var maxEnemies = 8; // Base maximum number of enemies allowed
var enemySpeedMultiplier = 1.0; // Gradually increases enemy speed
var explosionRadius = 150; // Radius for chain explosions
var difficultyLevel = 0; // Current difficulty level
var lastDifficultyScore = 0; // Score at last difficulty increase
var healthPacks = [];
var lastHealthPackSpawn = 0;
var bulletSpeedBoostTimer = 0; // Timer for bullet speed boost
var baseBulletSpeed = 15; // Base bullet speed
// Start main music
LK.playMusic('Main');
// Initialize music state tracking
game.main1Playing = false;
// Create player
player = game.addChild(new Player());
player.x = 500;
player.y = 1000;
// Function to spawn new enemy from random edge
function spawnNewEnemy() {
	var enemy = game.addChild(new Enemy());
	var attempts = 0;
	var maxAttempts = 30;
	var safeDistance = 600; // Much larger minimum safe distance from player
	var enemySafeDistance = 200; // Minimum distance from other enemies
	do {
		// Spawn from random edge
		var edge = Math.floor(Math.random() * 4);
		if (edge === 0) {
			// Top edge
			enemy.x = 150 + Math.random() * 1748;
			enemy.y = 150;
		} else if (edge === 1) {
			// Right edge
			enemy.x = 1898;
			enemy.y = 150 + Math.random() * 2432;
		} else if (edge === 2) {
			// Bottom edge
			enemy.x = 150 + Math.random() * 1748;
			enemy.y = 2582;
		} else {
			// Left edge
			enemy.x = 150;
			enemy.y = 150 + Math.random() * 2432;
		}
		// Check distance from player
		var dx = enemy.x - player.x;
		var dy = enemy.y - player.y;
		var distanceFromPlayer = Math.sqrt(dx * dx + dy * dy);
		// Check distance from other enemies to prevent clustering at spawn
		var tooCloseToEnemies = false;
		for (var e = 0; e < enemies.length; e++) {
			if (!enemies[e].isRespawning) {
				var edx = enemy.x - enemies[e].x;
				var edy = enemy.y - enemies[e].y;
				var enemyDistance = Math.sqrt(edx * edx + edy * edy);
				if (enemyDistance < enemySafeDistance) {
					tooCloseToEnemies = true;
					break;
				}
			}
		}
		attempts++;
	} while ((distanceFromPlayer < safeDistance || tooCloseToEnemies) && attempts < maxAttempts);
	// Give new enemies a brief spawn immunity to prevent instant collision damage
	enemy.spawnImmunityTimer = 60; // 1 second of spawn immunity
	enemy.targetX = enemy.x;
	enemy.targetY = enemy.y;
	enemies.push(enemy);
}
// Create initial enemies from random edge positions
for (var i = 0; i < 3; i++) {
	spawnNewEnemy();
}
// UI Elements
var instructionText = new Text2('Tap to move - Auto attack enemies nearby', {
	size: 40,
	fill: 0xFFFFFF
});
instructionText.anchor.set(0.5, 0);
LK.gui.top.addChild(instructionText);
instructionText.y = 100;
// Score display
var scoreText = new Text2('Score: 0', {
	size: 50,
	fill: 0xFFD700
});
scoreText.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreText);
scoreText.y = 150;
var dragNode = null;
var lastTouchTime = 0;
// Touch controls
game.down = function (x, y, obj) {
	if (player.isRespawning) return;
	// Keep target position in bounds
	targetX = Math.max(150, Math.min(1898, x));
	targetY = Math.max(150, Math.min(2582, y));
	// Stop any current movement tween
	tween.stop(player, {
		x: true,
		y: true
	});
	// Calculate distance for duration (closer = faster)
	var distance = Math.sqrt(Math.pow(targetX - player.x, 2) + Math.pow(targetY - player.y, 2));
	var duration = Math.max(200, Math.min(1000, distance * 2)); // 200ms to 1000ms based on distance
	isMovingToTarget = true;
	// Tween player to target position
	tween(player, {
		x: targetX,
		y: targetY
	}, {
		duration: duration,
		easing: tween.easeOut,
		onFinish: function onFinish() {
			isMovingToTarget = false;
		}
	});
};
game.move = function (x, y, obj) {
	// No drag movement needed - player moves via tween to clicked position
};
game.up = function (x, y, obj) {
	// No action needed - player auto-attacks when moving
};
// Main game loop
game.update = function () {
	// Music transitions based on score
	if (score >= 50 && score < 100) {
		// Play main1 music from score 50 to 100
		if (!game.main1Playing) {
			LK.stopMusic();
			LK.playMusic('main1');
			game.main1Playing = true;
		}
	} else if (score >= 100) {
		// Stop music when score reaches 100
		if (game.main1Playing) {
			LK.stopMusic();
			game.main1Playing = false;
		}
	}
	// Update bullet speed boost timer
	if (bulletSpeedBoostTimer > 0) {
		bulletSpeedBoostTimer--;
	}
	// Check for fire rate boost every 100 kills
	var newFireRateBoostLevel = Math.floor(enemiesKilled / 100);
	if (newFireRateBoostLevel > fireRateBoostLevel) {
		fireRateBoostLevel = newFireRateBoostLevel;
		// Visual feedback for fire rate increase
		LK.effects.flashScreen(0x0099FF, 300); // Blue flash to indicate fire rate boost
	}
	// Check for difficulty increase every 25 points
	if (score - lastDifficultyScore >= 25) {
		difficultyLevel++;
		lastDifficultyScore = score;
		// Increase enemy speed more significantly with each difficulty level
		enemySpeedMultiplier += 0.3; // More noticeable speed increase per difficulty level
		// Spawn additional enemies based on difficulty level
		var enemiesToSpawn = Math.min(2, difficultyLevel); // Spawn 1-2 enemies per difficulty increase
		for (var d = 0; d < enemiesToSpawn && enemies.length < maxEnemies + difficultyLevel; d++) {
			spawnNewEnemy();
		}
		// Visual feedback for difficulty increase
		LK.effects.flashScreen(0x00FF00, 500); // Green flash to indicate difficulty increase
	}
	// Gradually increase enemy speed over time (reduced base increase since we have difficulty scaling)
	enemySpeedMultiplier += 0.0002; // Slower base increase, main increases come from difficulty levels
	// Spawn health pack when player health is low (below 25%)
	if (player.health < player.maxHealth * 0.25 && LK.ticks - lastHealthPackSpawn > 300 &&
	// 5 second cooldown
	healthPacks.length === 0) {
		// Only one health pack at a time
		var healthPack = game.addChild(new HealthPack());
		// Spawn at random location away from enemies
		var attempts = 0;
		var maxAttempts = 20;
		var minSafeDistance = 200;
		do {
			healthPack.x = 300 + Math.random() * 1400;
			healthPack.y = 400 + Math.random() * 1800;
			var isSafe = true;
			for (var e = 0; e < enemies.length; e++) {
				if (!enemies[e].isRespawning) {
					var dx = healthPack.x - enemies[e].x;
					var dy = healthPack.y - enemies[e].y;
					var distance = Math.sqrt(dx * dx + dy * dy);
					if (distance < minSafeDistance) {
						isSafe = false;
						break;
					}
				}
			}
			attempts++;
		} while (!isSafe && attempts < maxAttempts);
		healthPacks.push(healthPack);
		lastHealthPackSpawn = LK.ticks;
	}
	// Update all game objects
	player.update();
	for (var i = 0; i < enemies.length; i++) {
		enemies[i].update();
	}
	// Update health packs and clean up destroyed ones
	for (var i = healthPacks.length - 1; i >= 0; i--) {
		var healthPack = healthPacks[i];
		if (healthPack.destroyed) {
			healthPacks.splice(i, 1);
		} else {
			healthPack.update();
		}
	}
	// Update bullets and clean up destroyed ones
	for (var i = bullets.length - 1; i >= 0; i--) {
		var bullet = bullets[i];
		if (bullet.destroyed === true || !bullet.parent) {
			bullets.splice(i, 1);
		} else {
			bullet.update();
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -734,10 +734,10 @@
 		LK.effects.flashScreen(0x00FF00, 500); // Green flash to indicate difficulty increase
 	}
 	// Gradually increase enemy speed over time (reduced base increase since we have difficulty scaling)
 	enemySpeedMultiplier += 0.0002; // Slower base increase, main increases come from difficulty levels
-	// Spawn health pack when player health is low (below 33%)
-	if (player.health < player.maxHealth * 0.33 && LK.ticks - lastHealthPackSpawn > 300 &&
+	// Spawn health pack when player health is low (below 25%)
+	if (player.health < player.maxHealth * 0.25 && LK.ticks - lastHealthPackSpawn > 300 &&
 	// 5 second cooldown
 	healthPacks.length === 0) {
 		// Only one health pack at a time
 		var healthPack = game.addChild(new HealthPack());