/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");
var storage = LK.import("@upit/storage.v1", {
	currentLevel: 1,
	unlockedLevels: 1,
	gameMode: "story",
	storyProgress: 0
});

/**** 
* Classes
****/ 
var Boss = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('boss', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 1;
	self.hp = 10;
	self.shootTimer = 0;
	self.shootInterval = 30;
	self.moveDirection = 1;
	self.update = function () {
		self.y += self.speed;
		self.x += self.moveDirection * 2;
		if (self.x <= 100 || self.x >= 1948) {
			self.moveDirection *= -1;
		}
		self.shootTimer++;
		if (self.shootTimer >= self.shootInterval) {
			self.shootTimer = 0;
			var bullet = new EnemyBullet();
			bullet.x = self.x;
			bullet.y = self.y + 60;
			enemyBullets.push(bullet);
			game.addChild(bullet);
		}
	};
	return self;
});
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 3;
	// Varied health based on current level and randomization
	var baseHp = Math.floor(storage.currentLevel / 2) + 1;
	self.hp = baseHp + (Math.random() < 0.3 ? Math.floor(Math.random() * 2) + 1 : 0);
	self.maxHp = self.hp;
	self.shootTimer = 0;
	self.shootInterval = 120;
	// Visual indicator for health - tint red for high HP enemies
	if (self.hp > 2) {
		graphics.tint = 0xFF6666;
	} else if (self.hp > 1) {
		graphics.tint = 0xFFAAAA;
	}
	self.update = function () {
		self.y += self.speed;
		self.shootTimer++;
		if (self.shootTimer >= self.shootInterval && Math.random() < 0.01) {
			self.shootTimer = 0;
			var bullet = new EnemyBullet();
			bullet.x = self.x;
			bullet.y = self.y + 30;
			enemyBullets.push(bullet);
			game.addChild(bullet);
		}
		// Update tint based on current health
		if (self.hp < self.maxHp) {
			var healthRatio = self.hp / self.maxHp;
			if (healthRatio < 0.3) {
				graphics.tint = 0xFF0000;
			} else if (healthRatio < 0.7) {
				graphics.tint = 0xFF6666;
			}
		}
	};
	return self;
});
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('enemyBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 8;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
var LevelSelectScreen = Container.expand(function () {
	var self = Container.call(this);
	var titleText = new Text2('SELECT LEVEL', {
		size: 100,
		fill: 0xFFFFFF
	});
	titleText.anchor.set(0.5, 0.5);
	titleText.x = 1024;
	titleText.y = 300;
	self.addChild(titleText);
	var levelButtons = [];
	for (var i = 1; i <= 10; i++) {
		var button = new Text2(i.toString(), {
			size: 60,
			fill: i <= storage.unlockedLevels ? 0xFFFFFF : 0x666666
		});
		button.anchor.set(0.5, 0.5);
		button.x = 400 + (i - 1) % 5 * 300;
		button.y = 600 + Math.floor((i - 1) / 5) * 200;
		button.levelNumber = i;
		self.addChild(button);
		levelButtons.push(button);
	}
	var backButton = new Text2('BACK', {
		size: 80,
		fill: 0xFF0000
	});
	backButton.anchor.set(0.5, 0.5);
	backButton.x = 1024;
	backButton.y = 1400;
	self.addChild(backButton);
	self.down = function (x, y, obj) {
		var clickPos = obj.parent ? self.toLocal(obj.parent.toGlobal(obj.position)) : {
			x: x,
			y: y
		};
		if (clickPos.y > 1350 && clickPos.y < 1450) {
			// Back button clicked
			showMenu();
			return;
		}
		// Check level buttons
		for (var i = 0; i < levelButtons.length; i++) {
			var btn = levelButtons[i];
			if (Math.abs(clickPos.x - btn.x) < 100 && Math.abs(clickPos.y - btn.y) < 50) {
				if (btn.levelNumber <= storage.unlockedLevels) {
					storage.gameMode = 'level';
					storage.currentLevel = btn.levelNumber;
					startGame();
				}
				break;
			}
		}
	};
	return self;
});
var MenuScreen = Container.expand(function () {
	var self = Container.call(this);
	var titleText = new Text2('SPACE DEFENDER', {
		size: 120,
		fill: 0xFFFFFF
	});
	titleText.anchor.set(0.5, 0.5);
	titleText.x = 1024;
	titleText.y = 400;
	self.addChild(titleText);
	var storyButton = new Text2('STORY MODE', {
		size: 80,
		fill: 0x00FF00
	});
	storyButton.anchor.set(0.5, 0.5);
	storyButton.x = 1024;
	storyButton.y = 800;
	self.addChild(storyButton);
	var levelsButton = new Text2('LEVEL SELECT', {
		size: 80,
		fill: 0x0080FF
	});
	levelsButton.anchor.set(0.5, 0.5);
	levelsButton.x = 1024;
	levelsButton.y = 1000;
	self.addChild(levelsButton);
	var endlessButton = new Text2('ENDLESS MODE', {
		size: 80,
		fill: 0xFF8000
	});
	endlessButton.anchor.set(0.5, 0.5);
	endlessButton.x = 1024;
	endlessButton.y = 1200;
	self.addChild(endlessButton);
	var tutorialButton = new Text2('TUTORIAL', {
		size: 80,
		fill: 0xFFFF00
	});
	tutorialButton.anchor.set(0.5, 0.5);
	tutorialButton.x = 1024;
	tutorialButton.y = 1400;
	self.addChild(tutorialButton);
	self.down = function (x, y, obj) {
		var clickPos = obj.parent ? self.toLocal(obj.parent.toGlobal(obj.position)) : {
			x: x,
			y: y
		};
		if (clickPos.y > 750 && clickPos.y < 850) {
			// Story mode clicked
			storage.gameMode = 'story';
			storage.currentLevel = storage.storyProgress + 1;
			startGame();
		} else if (clickPos.y > 950 && clickPos.y < 1050) {
			// Level select clicked
			showLevelSelect();
		} else if (clickPos.y > 1150 && clickPos.y < 1250) {
			// Endless mode clicked
			storage.gameMode = 'endless';
			storage.currentLevel = 1;
			startGame();
		} else if (clickPos.y > 1350 && clickPos.y < 1450) {
			// Tutorial clicked
			showTutorial();
		}
	};
	return self;
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.hp = 3;
	self.shootTimer = 0;
	self.shootInterval = 15;
	self.powerUpTimer = 0;
	self.rapidFire = false;
	self.gunChangeTimer = 0;
	self.update = function () {
		self.shootTimer++;
		self.gunChangeTimer++;
		// Auto-cycle gun types every 5 seconds for tutorial effect
		if (self.gunChangeTimer >= 300) {
			self.gunChangeTimer = 0;
			var gunTypeKeys = Object.keys(gunTypes);
			var currentIndex = gunTypeKeys.indexOf(currentGunType);
			currentGunType = gunTypeKeys[(currentIndex + 1) % gunTypeKeys.length];
		}
		var currentGun = gunTypes[currentGunType];
		var currentShootInterval = self.rapidFire ? 5 : currentGun.interval;
		if (self.shootTimer >= currentShootInterval) {
			self.shootTimer = 0;
			var bullet = new PlayerBullet();
			bullet.x = self.x;
			bullet.y = self.y - 40;
			bullet.damage = currentGun.damage;
			bullet.speed = -12 * currentGun.speedMultiplier;
			playerBullets.push(bullet);
			game.addChild(bullet);
			LK.getSound('shoot').play();
		}
		if (self.rapidFire) {
			self.powerUpTimer--;
			if (self.powerUpTimer <= 0) {
				self.rapidFire = false;
			}
		}
	};
	return self;
});
var PlayerBullet = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('playerBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -12;
	self.damage = 1;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
var PowerUp = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('powerUp', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 4;
	self.type = 'rapidFire'; // rapidFire, shield
	self.update = function () {
		self.y += self.speed;
		self.rotation += 0.1;
	};
	return self;
});
var StoryPanel = Container.expand(function (levelNumber) {
	var self = Container.call(this);
	var stories = ["The alien invasion has begun!\nDefend Earth's last outpost.", "Enemy forces are multiplying.\nPrepare for heavier resistance.", "Advanced alien fighters detected.\nUpgrade your weapons!", "The mothership approaches.\nThis is our final stand!", "Victory! Earth is safe.\nBut stay vigilant, commander."];
	var storyText = new Text2(stories[Math.min(levelNumber - 1, stories.length - 1)] || "Mission briefing loading...", {
		size: 70,
		fill: 0xFFFFFF
	});
	storyText.anchor.set(0.5, 0.5);
	storyText.x = 1024;
	storyText.y = 800;
	self.addChild(storyText);
	var continueText = new Text2('TAP TO CONTINUE', {
		size: 60,
		fill: 0x00FF00
	});
	continueText.anchor.set(0.5, 0.5);
	continueText.x = 1024;
	continueText.y = 1200;
	self.addChild(continueText);
	self.down = function (x, y, obj) {
		self.destroy();
		initializeGameplay();
	};
	return self;
});
var TutorialScreen = Container.expand(function () {
	var self = Container.call(this);
	var tutorialSteps = ["Welcome to Space Defender!\nTap and drag to move your ship.", "Your ship fires automatically.\nDestroy enemies to score points!", "Collect blue power-ups for rapid fire.\nAvoid enemy bullets!", "Different gun types affect your damage:\nBasic, Rapid, and Heavy modes.", "Enemies have different health levels.\nSome take multiple hits to destroy!", "Ready to begin your mission?\nTap to start the game!"];
	var currentStep = 0;
	var stepText = new Text2(tutorialSteps[0], {
		size: 80,
		fill: 0xFFFFFF
	});
	stepText.anchor.set(0.5, 0.5);
	stepText.x = 1024;
	stepText.y = 800;
	self.addChild(stepText);
	var nextText = new Text2('TAP TO CONTINUE', {
		size: 60,
		fill: 0x00FF00
	});
	nextText.anchor.set(0.5, 0.5);
	nextText.x = 1024;
	nextText.y = 1200;
	self.addChild(nextText);
	var skipText = new Text2('SKIP TUTORIAL', {
		size: 50,
		fill: 0xFF0000
	});
	skipText.anchor.set(0.5, 0.5);
	skipText.x = 1024;
	skipText.y = 1400;
	self.addChild(skipText);
	self.down = function (x, y, obj) {
		var clickPos = obj.parent ? self.toLocal(obj.parent.toGlobal(obj.position)) : {
			x: x,
			y: y
		};
		// Skip tutorial
		if (clickPos.y > 1350 && clickPos.y < 1450) {
			self.destroy();
			initializeGameplay();
			return;
		}
		// Next step
		currentStep++;
		if (currentStep >= tutorialSteps.length) {
			self.destroy();
			initializeGameplay();
		} else {
			stepText.setText(tutorialSteps[currentStep]);
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000033
});

/**** 
* Game Code
****/ 
// Game state variables
var gameState = 'menu'; // menu, levelSelect, story, playing, tutorial
var menuScreen = null;
var levelSelectScreen = null;
var storyPanel = null;
var tutorialScreen = null;
// Gun types system
var gunTypes = {
	basic: {
		damage: 1,
		speedMultiplier: 1.0,
		interval: 15
	},
	rapid: {
		damage: 1,
		speedMultiplier: 1.2,
		interval: 8
	},
	heavy: {
		damage: 3,
		speedMultiplier: 0.8,
		interval: 25
	}
};
var currentGunType = 'basic';
// Game variables
var player;
var playerBullets = [];
var enemies = [];
var enemyBullets = [];
var powerUps = [];
var bosses = [];
var enemySpawnTimer = 0;
var enemySpawnInterval = 60;
var powerUpSpawnTimer = 0;
var bossSpawnScore = 500;
var nextBossScore = bossSpawnScore;
var dragNode = null;
var waveLevel = 1;
var levelTargetScore = 0;
var levelCompleted = false;
// UI Elements
var scoreTxt = new Text2('Score: 0', {
	size: 60,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0, 0);
scoreTxt.x = 120;
scoreTxt.y = 50;
var hpTxt = new Text2('HP: 3', {
	size: 60,
	fill: 0xFF0000
});
hpTxt.anchor.set(1, 0);
hpTxt.x = -50;
hpTxt.y = 50;
var levelTxt = new Text2('Level: 1', {
	size: 60,
	fill: 0x00FF00
});
levelTxt.anchor.set(0.5, 0);
levelTxt.y = 50;
function showMenu() {
	gameState = 'menu';
	clearGame();
	menuScreen = new MenuScreen();
	game.addChild(menuScreen);
}
function showLevelSelect() {
	gameState = 'levelSelect';
	if (menuScreen) {
		menuScreen.destroy();
		menuScreen = null;
	}
	levelSelectScreen = new LevelSelectScreen();
	game.addChild(levelSelectScreen);
}
function showTutorial() {
	gameState = 'tutorial';
	if (menuScreen) {
		menuScreen.destroy();
		menuScreen = null;
	}
	storage.gameMode = 'tutorial';
	storage.currentLevel = 1;
	tutorialScreen = new TutorialScreen();
	game.addChild(tutorialScreen);
}
function startGame() {
	gameState = storage.gameMode === 'story' ? 'story' : 'playing';
	if (levelSelectScreen) {
		levelSelectScreen.destroy();
		levelSelectScreen = null;
	}
	if (menuScreen) {
		menuScreen.destroy();
		menuScreen = null;
	}
	if (storage.gameMode === 'story' && storage.currentLevel <= 5) {
		storyPanel = new StoryPanel(storage.currentLevel);
		game.addChild(storyPanel);
	} else {
		initializeGameplay();
	}
}
function initializeGameplay() {
	gameState = 'playing';
	// Clear any story panel
	if (storyPanel) {
		storyPanel.destroy();
		storyPanel = null;
	}
	// Reset game variables
	clearGame();
	LK.setScore(0);
	// Set level parameters
	setupLevel(storage.currentLevel);
	// Initialize player
	player = new Player();
	player.x = 1024;
	player.y = 2400;
	game.addChild(player);
	// Add UI elements
	LK.gui.topLeft.addChild(scoreTxt);
	LK.gui.topRight.addChild(hpTxt);
	LK.gui.top.addChild(levelTxt);
	levelTxt.setText('Level: ' + storage.currentLevel);
}
function setupLevel(level) {
	// Set level-specific parameters
	if (storage.gameMode === 'endless') {
		levelTargetScore = 0; // No target for endless mode
		enemySpawnInterval = 60;
	} else {
		levelTargetScore = level * 200; // Score needed to complete level
		enemySpawnInterval = Math.max(20, 80 - level * 5);
		bossSpawnScore = levelTargetScore * 0.8;
		nextBossScore = bossSpawnScore;
	}
	levelCompleted = false;
}
function clearGame() {
	// Clear all game objects
	for (var i = 0; i < enemies.length; i++) {
		enemies[i].destroy();
	}
	for (var i = 0; i < enemyBullets.length; i++) {
		enemyBullets[i].destroy();
	}
	for (var i = 0; i < playerBullets.length; i++) {
		playerBullets[i].destroy();
	}
	for (var i = 0; i < powerUps.length; i++) {
		powerUps[i].destroy();
	}
	for (var i = 0; i < bosses.length; i++) {
		bosses[i].destroy();
	}
	if (player) {
		player.destroy();
		player = null;
	}
	// Clear arrays
	enemies = [];
	enemyBullets = [];
	playerBullets = [];
	powerUps = [];
	bosses = [];
	// Remove UI elements
	if (scoreTxt.parent) scoreTxt.parent.removeChild(scoreTxt);
	if (hpTxt.parent) hpTxt.parent.removeChild(hpTxt);
	if (levelTxt.parent) levelTxt.parent.removeChild(levelTxt);
}
function checkLevelComplete() {
	if (storage.gameMode !== 'endless' && !levelCompleted && LK.getScore() >= levelTargetScore) {
		levelCompleted = true;
		// Update progress
		if (storage.gameMode === 'story') {
			storage.storyProgress = Math.max(storage.storyProgress, storage.currentLevel);
		}
		storage.unlockedLevels = Math.max(storage.unlockedLevels, storage.currentLevel + 1);
		// Show level complete message
		var completeText = new Text2('LEVEL COMPLETE!', {
			size: 100,
			fill: 0x00FF00
		});
		completeText.anchor.set(0.5, 0.5);
		completeText.x = 1024;
		completeText.y = 1366;
		game.addChild(completeText);
		// Auto-advance after 2 seconds
		LK.setTimeout(function () {
			if (storage.gameMode === 'story' && storage.currentLevel < 5) {
				storage.currentLevel++;
				startGame();
			} else {
				showMenu();
			}
		}, 2000);
	}
}
// Initialize menu on start
showMenu();
// Event handlers
function handleMove(x, y, obj) {
	if (dragNode) {
		dragNode.x = Math.max(40, Math.min(2008, x));
		dragNode.y = Math.max(100, Math.min(2632, y));
	}
}
game.move = handleMove;
game.down = function (x, y, obj) {
	dragNode = player;
	handleMove(x, y, obj);
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Main game loop
game.update = function () {
	if (gameState !== 'playing') return;
	// Update score display
	scoreTxt.setText('Score: ' + LK.getScore());
	hpTxt.setText('HP: ' + player.hp);
	// Check level completion
	checkLevelComplete();
	// Spawn enemies
	enemySpawnTimer++;
	var currentSpawnInterval = Math.max(20, enemySpawnInterval - Math.floor(LK.getScore() / 100) * 5);
	if (enemySpawnTimer >= currentSpawnInterval) {
		enemySpawnTimer = 0;
		var enemy = new Enemy();
		enemy.x = Math.random() * 1800 + 124;
		enemy.y = -50;
		enemy.speed = 2 + Math.floor(LK.getScore() / 200) + (storage.currentLevel - 1);
		enemies.push(enemy);
		game.addChild(enemy);
	}
	// Spawn power-ups occasionally
	powerUpSpawnTimer++;
	if (powerUpSpawnTimer >= 900 && Math.random() < 0.02) {
		powerUpSpawnTimer = 0;
		var powerUp = new PowerUp();
		powerUp.x = Math.random() * 1800 + 124;
		powerUp.y = -50;
		powerUps.push(powerUp);
		game.addChild(powerUp);
	}
	// Spawn boss at score milestones
	if (LK.getScore() >= nextBossScore && bosses.length === 0) {
		var boss = new Boss();
		boss.x = 1024;
		boss.y = -100;
		bosses.push(boss);
		game.addChild(boss);
		nextBossScore += bossSpawnScore;
	}
	// Handle player bullets
	for (var i = playerBullets.length - 1; i >= 0; i--) {
		var bullet = playerBullets[i];
		if (bullet.lastY === undefined) bullet.lastY = bullet.y;
		// Remove bullets that go off screen
		if (bullet.lastY >= -50 && bullet.y < -50) {
			bullet.destroy();
			playerBullets.splice(i, 1);
			continue;
		}
		// Check collision with enemies
		var hitEnemy = false;
		for (var j = enemies.length - 1; j >= 0; j--) {
			if (bullet.intersects(enemies[j])) {
				enemies[j].hp -= bullet.damage || 1;
				// Visual feedback for damage
				tween(enemies[j], {
					tint: 0xFFFFFF
				}, {
					duration: 100,
					onFinish: function onFinish() {
						if (enemies[j] && enemies[j].hp > 2) {
							enemies[j].children[0].tint = 0xFF6666;
						} else if (enemies[j] && enemies[j].hp > 1) {
							enemies[j].children[0].tint = 0xFFAAAA;
						}
					}
				});
				if (enemies[j].hp <= 0) {
					LK.setScore(LK.getScore() + 10 * enemies[j].maxHp);
					LK.getSound('enemyHit').play();
					enemies[j].destroy();
					enemies.splice(j, 1);
				}
				bullet.destroy();
				playerBullets.splice(i, 1);
				hitEnemy = true;
				break;
			}
		}
		if (hitEnemy) continue;
		// Check collision with bosses
		for (var k = bosses.length - 1; k >= 0; k--) {
			if (bullet.intersects(bosses[k])) {
				bosses[k].hp -= bullet.damage || 1;
				// Visual feedback for boss damage
				tween(bosses[k], {
					tint: 0xFFFFFF
				}, {
					duration: 150
				});
				if (bosses[k].hp <= 0) {
					LK.setScore(LK.getScore() + 100);
					LK.getSound('enemyHit').play();
					bosses[k].destroy();
					bosses.splice(k, 1);
				}
				bullet.destroy();
				playerBullets.splice(i, 1);
				break;
			}
		}
		bullet.lastY = bullet.y;
	}
	// Handle enemy bullets
	for (var i = enemyBullets.length - 1; i >= 0; i--) {
		var bullet = enemyBullets[i];
		if (bullet.lastY === undefined) bullet.lastY = bullet.y;
		// Remove bullets that go off screen
		if (bullet.lastY <= 2782 && bullet.y > 2782) {
			bullet.destroy();
			enemyBullets.splice(i, 1);
			continue;
		}
		// Check collision with player
		if (bullet.intersects(player)) {
			player.hp--;
			LK.getSound('playerHit').play();
			LK.effects.flashObject(player, 0xff0000, 500);
			if (player.hp <= 0) {
				LK.setTimeout(function () {
					showMenu();
				}, 2000);
				LK.showGameOver();
				return;
			}
			bullet.destroy();
			enemyBullets.splice(i, 1);
		}
		bullet.lastY = bullet.y;
	}
	// Handle enemies
	for (var i = enemies.length - 1; i >= 0; i--) {
		var enemy = enemies[i];
		if (enemy.lastY === undefined) enemy.lastY = enemy.y;
		// Remove enemies that go off screen
		if (enemy.lastY <= 2782 && enemy.y > 2782) {
			enemy.destroy();
			enemies.splice(i, 1);
			continue;
		}
		// Check collision with player
		if (enemy.intersects(player)) {
			player.hp--;
			LK.getSound('playerHit').play();
			LK.effects.flashScreen(0xff0000, 1000);
			if (player.hp <= 0) {
				LK.setTimeout(function () {
					showMenu();
				}, 2000);
				LK.showGameOver();
				return;
			}
			enemy.destroy();
			enemies.splice(i, 1);
		}
		enemy.lastY = enemy.y;
	}
	// Handle bosses
	for (var i = bosses.length - 1; i >= 0; i--) {
		var boss = bosses[i];
		if (boss.lastY === undefined) boss.lastY = boss.y;
		// Remove bosses that go off screen
		if (boss.lastY <= 2782 && boss.y > 2782) {
			boss.destroy();
			bosses.splice(i, 1);
			continue;
		}
		// Check collision with player
		if (boss.intersects(player)) {
			player.hp--;
			LK.getSound('playerHit').play();
			LK.effects.flashScreen(0xff0000, 1000);
			if (player.hp <= 0) {
				LK.setTimeout(function () {
					showMenu();
				}, 2000);
				LK.showGameOver();
				return;
			}
		}
		boss.lastY = boss.y;
	}
	// Handle power-ups
	for (var i = powerUps.length - 1; i >= 0; i--) {
		var powerUp = powerUps[i];
		if (powerUp.lastY === undefined) powerUp.lastY = powerUp.y;
		// Remove power-ups that go off screen
		if (powerUp.lastY <= 2782 && powerUp.y > 2782) {
			powerUp.destroy();
			powerUps.splice(i, 1);
			continue;
		}
		// Check collision with player
		if (powerUp.intersects(player)) {
			LK.getSound('powerUpSound').play();
			if (powerUp.type === 'rapidFire') {
				player.rapidFire = true;
				player.powerUpTimer = 600; // 10 seconds at 60fps
			}
			powerUp.destroy();
			powerUps.splice(i, 1);
		}
		powerUp.lastY = powerUp.y;
	}
};

===================================================================
--- original.js
+++ change.js
@@ -47,11 +47,20 @@
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
 	self.speed = 3;
-	self.hp = 1;
+	// Varied health based on current level and randomization
+	var baseHp = Math.floor(storage.currentLevel / 2) + 1;
+	self.hp = baseHp + (Math.random() < 0.3 ? Math.floor(Math.random() * 2) + 1 : 0);
+	self.maxHp = self.hp;
 	self.shootTimer = 0;
 	self.shootInterval = 120;
+	// Visual indicator for health - tint red for high HP enemies
+	if (self.hp > 2) {
+		graphics.tint = 0xFF6666;
+	} else if (self.hp > 1) {
+		graphics.tint = 0xFFAAAA;
+	}
 	self.update = function () {
 		self.y += self.speed;
 		self.shootTimer++;
 		if (self.shootTimer >= self.shootInterval && Math.random() < 0.01) {
@@ -61,8 +70,17 @@
 			bullet.y = self.y + 30;
 			enemyBullets.push(bullet);
 			game.addChild(bullet);
 		}
+		// Update tint based on current health
+		if (self.hp < self.maxHp) {
+			var healthRatio = self.hp / self.maxHp;
+			if (healthRatio < 0.3) {
+				graphics.tint = 0xFF0000;
+			} else if (healthRatio < 0.7) {
+				graphics.tint = 0xFF6666;
+			}
+		}
 	};
 	return self;
 });
 var EnemyBullet = Container.expand(function () {
@@ -166,8 +184,16 @@
 	endlessButton.anchor.set(0.5, 0.5);
 	endlessButton.x = 1024;
 	endlessButton.y = 1200;
 	self.addChild(endlessButton);
+	var tutorialButton = new Text2('TUTORIAL', {
+		size: 80,
+		fill: 0xFFFF00
+	});
+	tutorialButton.anchor.set(0.5, 0.5);
+	tutorialButton.x = 1024;
+	tutorialButton.y = 1400;
+	self.addChild(tutorialButton);
 	self.down = function (x, y, obj) {
 		var clickPos = obj.parent ? self.toLocal(obj.parent.toGlobal(obj.position)) : {
 			x: x,
 			y: y
@@ -184,8 +210,11 @@
 			// Endless mode clicked
 			storage.gameMode = 'endless';
 			storage.currentLevel = 1;
 			startGame();
+		} else if (clickPos.y > 1350 && clickPos.y < 1450) {
+			// Tutorial clicked
+			showTutorial();
 		}
 	};
 	return self;
 });
@@ -199,16 +228,28 @@
 	self.shootTimer = 0;
 	self.shootInterval = 15;
 	self.powerUpTimer = 0;
 	self.rapidFire = false;
+	self.gunChangeTimer = 0;
 	self.update = function () {
 		self.shootTimer++;
-		var currentShootInterval = self.rapidFire ? 5 : self.shootInterval;
+		self.gunChangeTimer++;
+		// Auto-cycle gun types every 5 seconds for tutorial effect
+		if (self.gunChangeTimer >= 300) {
+			self.gunChangeTimer = 0;
+			var gunTypeKeys = Object.keys(gunTypes);
+			var currentIndex = gunTypeKeys.indexOf(currentGunType);
+			currentGunType = gunTypeKeys[(currentIndex + 1) % gunTypeKeys.length];
+		}
+		var currentGun = gunTypes[currentGunType];
+		var currentShootInterval = self.rapidFire ? 5 : currentGun.interval;
 		if (self.shootTimer >= currentShootInterval) {
 			self.shootTimer = 0;
 			var bullet = new PlayerBullet();
 			bullet.x = self.x;
 			bullet.y = self.y - 40;
+			bullet.damage = currentGun.damage;
+			bullet.speed = -12 * currentGun.speedMultiplier;
 			playerBullets.push(bullet);
 			game.addChild(bullet);
 			LK.getSound('shoot').play();
 		}
@@ -227,8 +268,9 @@
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
 	self.speed = -12;
+	self.damage = 1;
 	self.update = function () {
 		self.y += self.speed;
 	};
 	return self;
@@ -271,8 +313,58 @@
 		initializeGameplay();
 	};
 	return self;
 });
+var TutorialScreen = Container.expand(function () {
+	var self = Container.call(this);
+	var tutorialSteps = ["Welcome to Space Defender!\nTap and drag to move your ship.", "Your ship fires automatically.\nDestroy enemies to score points!", "Collect blue power-ups for rapid fire.\nAvoid enemy bullets!", "Different gun types affect your damage:\nBasic, Rapid, and Heavy modes.", "Enemies have different health levels.\nSome take multiple hits to destroy!", "Ready to begin your mission?\nTap to start the game!"];
+	var currentStep = 0;
+	var stepText = new Text2(tutorialSteps[0], {
+		size: 80,
+		fill: 0xFFFFFF
+	});
+	stepText.anchor.set(0.5, 0.5);
+	stepText.x = 1024;
+	stepText.y = 800;
+	self.addChild(stepText);
+	var nextText = new Text2('TAP TO CONTINUE', {
+		size: 60,
+		fill: 0x00FF00
+	});
+	nextText.anchor.set(0.5, 0.5);
+	nextText.x = 1024;
+	nextText.y = 1200;
+	self.addChild(nextText);
+	var skipText = new Text2('SKIP TUTORIAL', {
+		size: 50,
+		fill: 0xFF0000
+	});
+	skipText.anchor.set(0.5, 0.5);
+	skipText.x = 1024;
+	skipText.y = 1400;
+	self.addChild(skipText);
+	self.down = function (x, y, obj) {
+		var clickPos = obj.parent ? self.toLocal(obj.parent.toGlobal(obj.position)) : {
+			x: x,
+			y: y
+		};
+		// Skip tutorial
+		if (clickPos.y > 1350 && clickPos.y < 1450) {
+			self.destroy();
+			initializeGameplay();
+			return;
+		}
+		// Next step
+		currentStep++;
+		if (currentStep >= tutorialSteps.length) {
+			self.destroy();
+			initializeGameplay();
+		} else {
+			stepText.setText(tutorialSteps[currentStep]);
+		}
+	};
+	return self;
+});
 
 /**** 
 * Initialize Game
 ****/ 
@@ -283,12 +375,32 @@
 /**** 
 * Game Code
 ****/ 
 // Game state variables
-var gameState = 'menu'; // menu, levelSelect, story, playing
+var gameState = 'menu'; // menu, levelSelect, story, playing, tutorial
 var menuScreen = null;
 var levelSelectScreen = null;
 var storyPanel = null;
+var tutorialScreen = null;
+// Gun types system
+var gunTypes = {
+	basic: {
+		damage: 1,
+		speedMultiplier: 1.0,
+		interval: 15
+	},
+	rapid: {
+		damage: 1,
+		speedMultiplier: 1.2,
+		interval: 8
+	},
+	heavy: {
+		damage: 3,
+		speedMultiplier: 0.8,
+		interval: 25
+	}
+};
+var currentGunType = 'basic';
 // Game variables
 var player;
 var playerBullets = [];
 var enemies = [];
@@ -339,8 +451,19 @@
 	}
 	levelSelectScreen = new LevelSelectScreen();
 	game.addChild(levelSelectScreen);
 }
+function showTutorial() {
+	gameState = 'tutorial';
+	if (menuScreen) {
+		menuScreen.destroy();
+		menuScreen = null;
+	}
+	storage.gameMode = 'tutorial';
+	storage.currentLevel = 1;
+	tutorialScreen = new TutorialScreen();
+	game.addChild(tutorialScreen);
+}
 function startGame() {
 	gameState = storage.gameMode === 'story' ? 'story' : 'playing';
 	if (levelSelectScreen) {
 		levelSelectScreen.destroy();
@@ -522,11 +645,24 @@
 		// Check collision with enemies
 		var hitEnemy = false;
 		for (var j = enemies.length - 1; j >= 0; j--) {
 			if (bullet.intersects(enemies[j])) {
-				enemies[j].hp--;
+				enemies[j].hp -= bullet.damage || 1;
+				// Visual feedback for damage
+				tween(enemies[j], {
+					tint: 0xFFFFFF
+				}, {
+					duration: 100,
+					onFinish: function onFinish() {
+						if (enemies[j] && enemies[j].hp > 2) {
+							enemies[j].children[0].tint = 0xFF6666;
+						} else if (enemies[j] && enemies[j].hp > 1) {
+							enemies[j].children[0].tint = 0xFFAAAA;
+						}
+					}
+				});
 				if (enemies[j].hp <= 0) {
-					LK.setScore(LK.getScore() + 10);
+					LK.setScore(LK.getScore() + 10 * enemies[j].maxHp);
 					LK.getSound('enemyHit').play();
 					enemies[j].destroy();
 					enemies.splice(j, 1);
 				}
@@ -539,9 +675,15 @@
 		if (hitEnemy) continue;
 		// Check collision with bosses
 		for (var k = bosses.length - 1; k >= 0; k--) {
 			if (bullet.intersects(bosses[k])) {
-				bosses[k].hp--;
+				bosses[k].hp -= bullet.damage || 1;
+				// Visual feedback for boss damage
+				tween(bosses[k], {
+					tint: 0xFFFFFF
+				}, {
+					duration: 150
+				});
 				if (bosses[k].hp <= 0) {
 					LK.setScore(LK.getScore() + 100);
 					LK.getSound('enemyHit').play();
 					bosses[k].destroy();