/**** 
* Classes
****/ 
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 20;
	self.velocityX = 0;
	self.velocityY = 0;
	self.damage = 25;
	self.isPlayerBullet = true;
	self.update = function () {
		self.x += self.velocityX;
		self.y += self.velocityY;
	};
	return self;
});
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.health = 100;
	self.maxHealth = 100;
	self.speed = 6;
	self.lastShot = 0;
	self.shootCooldown = 300;
	self.lastMove = 0;
	self.moveTimer = 0;
	self.targetX = 0;
	self.targetY = 0;
	self.takeDamage = function (damage) {
		self.health -= damage;
		if (self.health <= 0) {
			self.health = 0;
			return true; // Enemy died
		}
		// Flash red when taking damage
		tween(enemyGraphics, {
			tint: 0xFF0000
		}, {
			duration: 100,
			onFinish: function onFinish() {
				tween(enemyGraphics, {
					tint: 0xFFFFFF
				}, {
					duration: 100
				});
			}
		});
		return false;
	};
	self.canShoot = function () {
		return LK.ticks - self.lastShot > self.shootCooldown;
	};
	self.shoot = function (targetX, targetY) {
		if (!self.canShoot()) {
			return null;
		}
		self.lastShot = LK.ticks;
		var bullet = new Bullet();
		bullet.x = self.x;
		bullet.y = self.y;
		var dx = targetX - self.x;
		var dy = targetY - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		bullet.velocityX = dx / distance * bullet.speed;
		bullet.velocityY = dy / distance * bullet.speed;
		bullet.isPlayerBullet = false;
		return bullet;
	};
	self.update = function () {
		// Simple AI movement
		if (LK.ticks - self.lastMove > self.moveTimer) {
			self.targetX = player.x + (Math.random() - 0.5) * 400;
			self.targetY = player.y + (Math.random() - 0.5) * 400;
			self.targetX = Math.max(200, Math.min(1848, self.targetX));
			self.targetY = Math.max(200, Math.min(2532, self.targetY));
			self.lastMove = LK.ticks;
			self.moveTimer = 60 + Math.random() * 120;
		}
		// Move towards target
		var dx = self.targetX - self.x;
		var dy = self.targetY - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance > 10) {
			self.x += dx / distance * self.speed;
			self.y += dy / distance * self.speed;
		}
		// Shoot at player occasionally
		if (self.canShoot() && Math.random() < 0.02) {
			var bullet = self.shoot(player.x, player.y);
			if (bullet) {
				bullets.push(bullet);
				game.addChild(bullet);
				LK.getSound('shoot').play();
			}
		}
	};
	return self;
});
var HealthPack = Container.expand(function () {
	var self = Container.call(this);
	var healthGraphics = self.attachAsset('healthPack', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.healAmount = 50;
	self.collected = false;
	self.update = function () {
		// Rotate for visual effect
		healthGraphics.rotation += 0.1;
		// Check if player collects it
		if (!self.collected && self.intersects(player)) {
			player.heal(self.healAmount);
			self.collected = true;
		}
	};
	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.speed = 8;
	self.materials = 100;
	self.lastShot = 0;
	self.shootCooldown = 200;
	self.takeDamage = function (damage) {
		self.health -= damage;
		if (self.health <= 0) {
			self.health = 0;
			return true; // Player died
		}
		// Flash red when taking damage
		tween(playerGraphics, {
			tint: 0xFF0000
		}, {
			duration: 100,
			onFinish: function onFinish() {
				tween(playerGraphics, {
					tint: 0xFFFFFF
				}, {
					duration: 100
				});
			}
		});
		return false;
	};
	self.heal = function (amount) {
		self.health = Math.min(self.maxHealth, self.health + amount);
	};
	self.canShoot = function () {
		return LK.ticks - self.lastShot > self.shootCooldown;
	};
	self.shoot = function (targetX, targetY) {
		if (!self.canShoot()) {
			return null;
		}
		self.lastShot = LK.ticks;
		var bullet = new Bullet();
		bullet.x = self.x;
		bullet.y = self.y;
		var dx = targetX - self.x;
		var dy = targetY - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		bullet.velocityX = dx / distance * bullet.speed;
		bullet.velocityY = dy / distance * bullet.speed;
		bullet.isPlayerBullet = true;
		return bullet;
	};
	return self;
});
var Structure = Container.expand(function (type) {
	var self = Container.call(this);
	self.structureType = type || 'wall';
	self.health = 200;
	self.maxHealth = 200;
	var structureGraphics = self.attachAsset(self.structureType, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.takeDamage = function (damage) {
		self.health -= damage;
		if (self.health <= 0) {
			return true; // Structure destroyed
		}
		// Visual feedback for damage
		var healthPercent = self.health / self.maxHealth;
		structureGraphics.alpha = 0.5 + healthPercent * 0.5;
		return false;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2E7D32
});

/**** 
* Game Code
****/ 
// Game state variables
var gameMode = 'combat'; // 'combat' or 'build'
var selectedStructure = 'wall';
var gridSize = 120;
var buildPreview = null;
var showBuildGrid = false;
// Game objects
var player = null;
var enemy = null;
var bullets = [];
var structures = [];
var healthPacks = [];
var buildGrids = [];
// UI elements
var healthBar = null;
var enemyHealthBar = null;
var materialsText = null;
var modeText = null;
var buildButtons = [];
// Initialize UI
function initializeUI() {
	// Player health bar
	healthBar = new Text2('Health: 100', {
		size: 40,
		fill: 0x4CAF50
	});
	healthBar.anchor.set(0, 0);
	healthBar.x = 150;
	healthBar.y = 50;
	LK.gui.topLeft.addChild(healthBar);
	// Enemy health bar
	enemyHealthBar = new Text2('Enemy: 100', {
		size: 40,
		fill: 0xF44336
	});
	enemyHealthBar.anchor.set(1, 0);
	enemyHealthBar.x = -50;
	enemyHealthBar.y = 50;
	LK.gui.topRight.addChild(enemyHealthBar);
	// Materials counter
	materialsText = new Text2('Materials: 100', {
		size: 40,
		fill: 0x795548
	});
	materialsText.anchor.set(0, 0);
	materialsText.x = 150;
	materialsText.y = 100;
	LK.gui.topLeft.addChild(materialsText);
	// Mode indicator
	modeText = new Text2('Combat Mode', {
		size: 60,
		fill: 0xFFFFFF
	});
	modeText.anchor.set(0.5, 0);
	modeText.x = 0;
	modeText.y = 50;
	LK.gui.top.addChild(modeText);
	// Build mode button
	var buildModeBtn = new Text2('BUILD', {
		size: 50,
		fill: 0xFFC107
	});
	buildModeBtn.anchor.set(0.5, 1);
	buildModeBtn.x = -100;
	buildModeBtn.y = -50;
	LK.gui.bottom.addChild(buildModeBtn);
	// Combat mode button
	var combatModeBtn = new Text2('COMBAT', {
		size: 50,
		fill: 0xFF5722
	});
	combatModeBtn.anchor.set(0.5, 1);
	combatModeBtn.x = 100;
	combatModeBtn.y = -50;
	LK.gui.bottom.addChild(combatModeBtn);
	// Structure selection buttons (visible in build mode)
	var wallBtn = new Text2('WALL', {
		size: 40,
		fill: 0x8D6E63
	});
	wallBtn.anchor.set(0, 1);
	wallBtn.x = 50;
	wallBtn.y = -120;
	LK.gui.bottomLeft.addChild(wallBtn);
	buildButtons.push(wallBtn);
	var rampBtn = new Text2('RAMP', {
		size: 40,
		fill: 0x795548
	});
	rampBtn.anchor.set(0, 1);
	rampBtn.x = 50;
	rampBtn.y = -170;
	LK.gui.bottomLeft.addChild(rampBtn);
	buildButtons.push(rampBtn);
	var floorBtn = new Text2('FLOOR', {
		size: 40,
		fill: 0x6D4C41
	});
	floorBtn.anchor.set(0, 1);
	floorBtn.x = 50;
	floorBtn.y = -220;
	LK.gui.bottomLeft.addChild(floorBtn);
	buildButtons.push(floorBtn);
	updateBuildButtonsVisibility();
}
function updateBuildButtonsVisibility() {
	for (var i = 0; i < buildButtons.length; i++) {
		buildButtons[i].visible = gameMode === 'build';
	}
}
function updateUI() {
	if (player) {
		healthBar.setText('Health: ' + player.health);
		materialsText.setText('Materials: ' + player.materials);
	}
	if (enemy) {
		enemyHealthBar.setText('Enemy: ' + enemy.health);
	}
	modeText.setText(gameMode === 'build' ? 'Build Mode' : 'Combat Mode');
}
function switchMode(newMode) {
	gameMode = newMode;
	updateBuildButtonsVisibility();
	if (gameMode === 'build') {
		showBuildGrid = true;
		createBuildGrid();
	} else {
		showBuildGrid = false;
		clearBuildGrid();
		if (buildPreview) {
			buildPreview.destroy();
			buildPreview = null;
		}
	}
}
function createBuildGrid() {
	clearBuildGrid();
	for (var x = gridSize; x < 2048; x += gridSize) {
		for (var y = gridSize; y < 2732; y += gridSize) {
			var grid = LK.getAsset('buildGrid', {
				anchorX: 0.5,
				anchorY: 0.5
			});
			grid.x = x;
			grid.y = y;
			grid.alpha = 0.2;
			buildGrids.push(grid);
			game.addChild(grid);
		}
	}
}
function clearBuildGrid() {
	for (var i = 0; i < buildGrids.length; i++) {
		buildGrids[i].destroy();
	}
	buildGrids = [];
}
function snapToGrid(x, y) {
	var snappedX = Math.round(x / gridSize) * gridSize;
	var snappedY = Math.round(y / gridSize) * gridSize;
	return {
		x: snappedX,
		y: snappedY
	};
}
function canBuildAt(x, y) {
	// Check if position is within bounds
	if (x < gridSize || x >= 2048 - gridSize || y < gridSize || y >= 2732 - gridSize) {
		return false;
	}
	// Check if there's already a structure here
	for (var i = 0; i < structures.length; i++) {
		var structure = structures[i];
		var dx = Math.abs(structure.x - x);
		var dy = Math.abs(structure.y - y);
		if (dx < gridSize && dy < gridSize) {
			return false;
		}
	}
	return true;
}
function buildStructure(x, y, type) {
	var snapped = snapToGrid(x, y);
	if (!canBuildAt(snapped.x, snapped.y)) {
		return false;
	}
	var cost = 10;
	if (player.materials < cost) {
		return false;
	}
	player.materials -= cost;
	var structure = new Structure(type);
	structure.x = snapped.x;
	structure.y = snapped.y;
	structures.push(structure);
	game.addChild(structure);
	LK.getSound('build').play();
	return true;
}
function spawnHealthPack() {
	if (healthPacks.length >= 3) {
		return;
	} // Max 3 health packs
	var healthPack = new HealthPack();
	healthPack.x = 200 + Math.random() * 1648;
	healthPack.y = 200 + Math.random() * 2332;
	healthPacks.push(healthPack);
	game.addChild(healthPack);
}
// Initialize game objects
function initializeGame() {
	// Create player
	player = new Player();
	player.x = 1024;
	player.y = 2200;
	game.addChild(player);
	// Create enemy
	enemy = new Enemy();
	enemy.x = 1024;
	enemy.y = 500;
	game.addChild(enemy);
	// Initialize UI
	initializeUI();
	// Spawn initial health pack
	spawnHealthPack();
}
// Event handlers
function handleMove(x, y, obj) {
	if (gameMode === 'build' && buildPreview) {
		var snapped = snapToGrid(x, y);
		buildPreview.x = snapped.x;
		buildPreview.y = snapped.y;
		buildPreview.alpha = canBuildAt(snapped.x, snapped.y) ? 0.7 : 0.3;
	}
}
function handleDown(x, y, obj) {
	if (gameMode === 'combat') {
		// Shoot at target location
		if (player.canShoot()) {
			var bullet = player.shoot(x, y);
			if (bullet) {
				bullets.push(bullet);
				game.addChild(bullet);
				LK.getSound('shoot').play();
			}
		}
	} else if (gameMode === 'build') {
		// Build structure
		buildStructure(x, y, selectedStructure);
	}
}
function handleUp(x, y, obj) {
	// Check UI button clicks using game coordinates
	var gamePos = game.toLocal({
		x: x,
		y: y
	});
	// Convert to GUI coordinates for button detection
	var guiBottomX = gamePos.x - 1024; // Relative to center
	var guiBottomY = gamePos.y - 2732; // Relative to bottom
	// Build mode button
	if (guiBottomX >= -150 && guiBottomX <= -50 && guiBottomY >= -100 && guiBottomY <= 0) {
		switchMode('build');
	}
	// Combat mode button
	if (guiBottomX >= 50 && guiBottomX <= 150 && guiBottomY >= -100 && guiBottomY <= 0) {
		switchMode('combat');
	}
	// Structure selection buttons
	if (gameMode === 'build') {
		var guiLeftX = gamePos.x; // Relative to left
		var guiLeftY = gamePos.y - 2732; // Relative to bottom
		if (guiLeftX >= 50 && guiLeftX <= 150) {
			if (guiLeftY >= -150 && guiLeftY <= -100) {
				selectedStructure = 'wall';
			} else if (guiLeftY >= -200 && guiLeftY <= -150) {
				selectedStructure = 'ramp';
			} else if (guiLeftY >= -250 && guiLeftY <= -200) {
				selectedStructure = 'floor';
			}
		}
	}
}
// Assign event handlers
game.move = handleMove;
game.down = handleDown;
game.up = handleUp;
// Main game loop
game.update = function () {
	// Update bullets
	for (var i = bullets.length - 1; i >= 0; i--) {
		var bullet = bullets[i];
		// Track last position for boundary checking
		if (bullet.lastX === undefined) {
			bullet.lastX = bullet.x;
		}
		if (bullet.lastY === undefined) {
			bullet.lastY = bullet.y;
		}
		// Check if bullet went off screen
		if (bullet.lastX >= 0 && bullet.x < 0 || bullet.lastX <= 2048 && bullet.x > 2048 || bullet.lastY >= 0 && bullet.y < 0 || bullet.lastY <= 2732 && bullet.y > 2732) {
			bullet.destroy();
			bullets.splice(i, 1);
			continue;
		}
		// Check collisions with structures
		var hitStructure = false;
		for (var j = structures.length - 1; j >= 0; j--) {
			var structure = structures[j];
			if (bullet.intersects(structure)) {
				if (structure.takeDamage(bullet.damage)) {
					structure.destroy();
					structures.splice(j, 1);
				}
				hitStructure = true;
				break;
			}
		}
		if (hitStructure) {
			bullet.destroy();
			bullets.splice(i, 1);
			LK.getSound('hit').play();
			continue;
		}
		// Check collisions with players
		if (bullet.isPlayerBullet && bullet.intersects(enemy)) {
			if (enemy.takeDamage(bullet.damage)) {
				LK.showYouWin();
				return;
			}
			bullet.destroy();
			bullets.splice(i, 1);
			LK.getSound('hit').play();
			continue;
		} else if (!bullet.isPlayerBullet && bullet.intersects(player)) {
			if (player.takeDamage(bullet.damage)) {
				LK.showGameOver();
				return;
			}
			bullet.destroy();
			bullets.splice(i, 1);
			LK.getSound('hit').play();
			continue;
		}
		// Update last position
		bullet.lastX = bullet.x;
		bullet.lastY = bullet.y;
	}
	// Update health packs
	for (var i = healthPacks.length - 1; i >= 0; i--) {
		var healthPack = healthPacks[i];
		if (healthPack.collected) {
			healthPack.destroy();
			healthPacks.splice(i, 1);
		}
	}
	// Spawn health packs periodically
	if (LK.ticks % 600 === 0) {
		// Every 10 seconds
		spawnHealthPack();
	}
	// Give player materials over time
	if (LK.ticks % 180 === 0) {
		// Every 3 seconds
		player.materials = Math.min(200, player.materials + 5);
	}
	// Update UI
	updateUI();
	// Handle build mode preview
	if (gameMode === 'build' && !buildPreview) {
		buildPreview = LK.getAsset(selectedStructure, {
			anchorX: 0.5,
			anchorY: 0.5
		});
		buildPreview.alpha = 0.5;
		game.addChild(buildPreview);
	} else if (gameMode !== 'build' && buildPreview) {
		buildPreview.destroy();
		buildPreview = null;
	}
	// Update build preview structure type
	if (buildPreview && buildPreview.structureType !== selectedStructure) {
		buildPreview.destroy();
		buildPreview = LK.getAsset(selectedStructure, {
			anchorX: 0.5,
			anchorY: 0.5
		});
		buildPreview.alpha = 0.5;
		game.addChild(buildPreview);
	}
};
// Start the game
initializeGame();

===================================================================
--- original.js
+++ change.js
@@ -1,10 +1,5 @@
 /**** 
-* Plugins
-****/ 
-var tween = LK.import("@upit/tween.v1");
-
-/**** 
 * Classes
 ****/ 
 var Bullet = Container.expand(function () {
 	var self = Container.call(this);