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

/**** 
* Classes
****/ 
// Base class
var Base = Container.expand(function () {
	var self = Container.call(this);
	// Attach base asset (ellipse, blue)
	var baseGraphics = self.attachAsset('base', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	baseGraphics.width = 180;
	baseGraphics.height = 180;
	baseGraphics.color = 0x3399ff;
	self.maxHp = 20;
	self.hp = self.maxHp;
	// Flash on hit
	self.hit = function () {
		LK.effects.flashObject(self, 0xff0000, 400);
	};
	// Repair
	self.repair = function () {
		self.hp = Math.min(self.maxHp, self.hp + 5);
	};
	// Upgrade
	self.upgrade = function () {
		self.maxHp += 10;
		self.hp = self.maxHp;
		baseGraphics.scaleX += 0.1;
		baseGraphics.scaleY += 0.1;
	};
	return self;
});
// Bullet class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	// Attach bullet asset (box, yellow)
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	bulletGraphics.width = 40;
	bulletGraphics.height = 40;
	bulletGraphics.color = 0xb8b031;
	self.speed = 24;
	self.target = null;
	self.side = 1;
	self.damage = 1;
	self.update = function () {
		if (!self.target || self.target.destroyed) {
			self.destroy();
			return;
		}
		var dx = self.target.x - self.x;
		var dy = self.target.y - self.y;
		var dist = Math.sqrt(dx * dx + dy * dy);
		if (dist < 40) {
			// Hit!
			self.target.hp -= self.damage;
			LK.effects.flashObject(self.target, 0xffff00, 200);
			self.destroy();
			return;
		}
		var step = self.speed;
		self.x += dx / dist * step;
		self.y += dy / dist * step;
	};
	return self;
});
// Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	// Attach enemy asset (ellipse, red)
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Set size and color
	enemyGraphics.width = 90;
	enemyGraphics.height = 90;
	enemyGraphics.color = 0xd83318;
	// Enemy properties
	self.speed = 3 + Math.random() * 1.5; // Will be set per wave
	self.hp = 1; // Will be set per wave
	self.direction = 1; // 1 for right-to-left, -1 for left-to-right
	// Update method
	self.update = function () {
		self.x += self.speed * self.direction;
	};
	return self;
});
// Turret class
var Turret = Container.expand(function () {
	var self = Container.call(this);
	// Attach turret asset (box, green)
	var turretGraphics = self.attachAsset('turret', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	turretGraphics.width = 100;
	turretGraphics.height = 100;
	turretGraphics.color = 0x83de44;
	// Turret properties
	self.range = 500;
	self.fireRate = 60; // frames between shots
	self.cooldown = 0;
	self.level = 1;
	self.side = 1; // 1 = right, -1 = left
	// Upgrade method
	self.upgrade = function () {
		if (self.level < 3) {
			self.level += 1;
			self.range += 100;
			self.fireRate = Math.max(30, self.fireRate - 10);
			turretGraphics.scaleX += 0.1;
			turretGraphics.scaleY += 0.1;
		}
	};
	// Update method
	self.update = function () {
		if (self.cooldown > 0) {
			self.cooldown--;
			return;
		}
		// Find closest enemy in range on this side
		var closest = null;
		var minDist = self.range + 1;
		for (var i = 0; i < enemies.length; i++) {
			var e = enemies[i];
			if (self.side === 1 && e.x > base.x || self.side === -1 && e.x < base.x) {
				var dx = e.x - self.x;
				var dy = e.y - self.y;
				var dist = Math.sqrt(dx * dx + dy * dy);
				if (dist < minDist && dist <= self.range) {
					minDist = dist;
					closest = e;
				}
			}
		}
		if (closest) {
			// Fire at enemy
			var b = new Bullet();
			b.x = self.x;
			b.y = self.y;
			b.target = closest;
			b.side = self.side;
			b.damage = self.level;
			bullets.push(b);
			game.addChild(b);
			self.cooldown = self.fireRate;
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x181818
});

/**** 
* Game Code
****/ 
// Game state variables
var base = new Base();
base.x = 2048 / 2;
base.y = 2732 / 2;
game.addChild(base);
var turrets = [];
var enemies = [];
var bullets = [];
var gold = 50;
var wave = 1;
var enemiesToSpawn = 0;
var enemiesSpawned = 0;
var enemiesPerWave = 6;
var waveInProgress = false;
var spawnTimer = 0;
var nextWaveTimer = 0;
var baseHealthTxt, goldTxt, waveTxt;
var selectedTurret = null;
// HP Bar for base (gray background, green foreground)
var baseHpBarBg = LK.getAsset('base', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: base.x,
	y: base.y - 140,
	width: 200,
	height: 32,
	color: 0x444444
});
var baseHpBar = LK.getAsset('base', {
	anchorX: 0,
	anchorY: 0.5,
	x: base.x - 100,
	y: base.y - 140,
	width: 200,
	height: 32,
	color: 0x44ff44
});
// Add ground platform at the bottom of the screen
var ground = LK.getAsset('base', {
	anchorX: 0.5,
	anchorY: 1,
	x: 2048 / 2,
	y: 2732,
	width: 2048,
	height: 80,
	color: 0x888888
});
game.addChild(ground);
// GUI
// HP text removed
goldTxt = new Text2("Gold: " + gold, {
	size: 80,
	fill: 0xFFD700
});
goldTxt.anchor.set(1, 0);
LK.gui.topRight.addChild(goldTxt);
waveTxt = new Text2("Wave: " + wave, {
	size: 80,
	fill: "#fff"
});
waveTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(waveTxt);
// Turret placement buttons (left and right)
// Space out the buttons and texts at the bottom of the screen for better separation
var bottomY = 2732 - 180;
var leftTurretBtn = LK.getAsset('turret', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 2048 / 2 - 700,
	y: bottomY,
	scaleX: 1.2,
	scaleY: 1.2
});
var rightTurretBtn = LK.getAsset('turret', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 2048 / 2 + 700,
	y: bottomY,
	scaleX: 1.2,
	scaleY: 1.2
});
game.addChild(leftTurretBtn);
game.addChild(rightTurretBtn);
var leftTurretCostTxt = new Text2("Buy: 30", {
	size: 60,
	fill: "#fff"
});
leftTurretCostTxt.anchor.set(0.5, 0);
leftTurretCostTxt.x = leftTurretBtn.x;
leftTurretCostTxt.y = leftTurretBtn.y + 100;
game.addChild(leftTurretCostTxt);
var rightTurretCostTxt = new Text2("Buy: 30", {
	size: 60,
	fill: "#fff"
});
rightTurretCostTxt.anchor.set(0.5, 0);
rightTurretCostTxt.x = rightTurretBtn.x;
rightTurretCostTxt.y = rightTurretBtn.y + 100;
game.addChild(rightTurretCostTxt);
// Base repair and upgrade buttons
var repairBtn = LK.getAsset('base', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 2048 / 2 - 350,
	y: bottomY,
	scaleX: 0.7,
	scaleY: 0.7
});
var upgradeBtn = LK.getAsset('base', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 2048 / 2 + 350,
	y: bottomY,
	scaleX: 0.7,
	scaleY: 0.7
});
game.addChild(repairBtn);
game.addChild(upgradeBtn);
var repairCostTxt = new Text2("Repair: 15", {
	size: 60,
	fill: "#fff"
});
repairCostTxt.anchor.set(0.5, 0);
repairCostTxt.x = repairBtn.x;
repairCostTxt.y = repairBtn.y + 100;
game.addChild(repairCostTxt);
var upgradeCostTxt = new Text2("Upgrade: 40", {
	size: 60,
	fill: "#fff"
});
upgradeCostTxt.anchor.set(0.5, 0);
upgradeCostTxt.x = upgradeBtn.x;
upgradeCostTxt.y = upgradeBtn.y + 100;
game.addChild(upgradeCostTxt);
// Turret upgrade buttons (appear above turrets)
function showTurretUpgradeBtn(turret) {
	if (turret.upgradeBtn) {
		return;
	}
	var btn = LK.getAsset('turret', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: turret.x,
		y: turret.y - 120,
		scaleX: 0.6,
		scaleY: 0.6
	});
	var txt = new Text2("Upgrade: 25", {
		size: 50,
		fill: "#fff"
	});
	txt.anchor.set(0.5, 0);
	txt.x = btn.x;
	txt.y = btn.y + 50;
	btn._upgradeTxt = txt;
	game.addChild(btn);
	game.addChild(txt);
	turret.upgradeBtn = btn;
	turret.upgradeTxt = txt;
}
// Remove upgrade button
function hideTurretUpgradeBtn(turret) {
	if (turret.upgradeBtn) {
		turret.upgradeBtn.destroy();
		turret.upgradeTxt.destroy();
		turret.upgradeBtn = null;
		turret.upgradeTxt = null;
	}
}
// Place initial turrets
function placeTurret(side) {
	var x = base.x + (side === 1 ? 300 : -300);
	var y = base.y;
	var t = new Turret();
	t.x = x;
	t.y = y;
	t.side = side;
	turrets.push(t);
	game.addChild(t);
	return t;
}
// Initial turrets
placeTurret(-1);
placeTurret(1);
// Handle turret placement
leftTurretBtn.down = function (x, y, obj) {
	if (gold >= 30) {
		var t = placeTurret(-1);
		gold -= 30;
		goldTxt.setText("Gold: " + gold);
	}
};
rightTurretBtn.down = function (x, y, obj) {
	if (gold >= 30) {
		var t = placeTurret(1);
		gold -= 30;
		goldTxt.setText("Gold: " + gold);
	}
};
// Handle base repair/upgrade
repairBtn.down = function (x, y, obj) {
	if (gold >= 15 && base.hp < base.maxHp) {
		base.repair();
		gold -= 15;
		goldTxt.setText("Gold: " + gold);
		baseHealthTxt.setText("HP: " + base.hp);
	}
};
upgradeBtn.down = function (x, y, obj) {
	if (gold >= 40) {
		base.upgrade();
		gold -= 40;
		goldTxt.setText("Gold: " + gold);
		baseHealthTxt.setText("HP: " + base.hp);
	}
};
// Handle turret upgrade
game.down = function (x, y, obj) {
	// Check if a turret was tapped
	for (var i = 0; i < turrets.length; i++) {
		var t = turrets[i];
		if (t && LK.util && typeof LK.util.containsPoint === "function" && LK.util.containsPoint(t, {
			x: x,
			y: y
		})) {
			selectedTurret = t;
			showTurretUpgradeBtn(t);
			return;
		}
	}
	// Check if upgrade button was tapped
	for (var i = 0; i < turrets.length; i++) {
		var t = turrets[i];
		if (t && t.upgradeBtn && LK.util && typeof LK.util.containsPoint === "function" && LK.util.containsPoint(t.upgradeBtn, {
			x: x,
			y: y
		})) {
			if (gold >= 25 && t.level < 3) {
				t.upgrade();
				gold -= 25;
				goldTxt.setText("Gold: " + gold);
				if (t.level >= 3) {
					hideTurretUpgradeBtn(t);
				}
			}
			return;
		}
	}
	// Deselect turret if tap elsewhere
	for (var i = 0; i < turrets.length; i++) {
		hideTurretUpgradeBtn(turrets[i]);
	}
	selectedTurret = null;
};
// Enemy spawn logic
function startWave() {
	waveInProgress = true;
	enemiesToSpawn = enemiesPerWave + (wave - 1) * 2;
	enemiesSpawned = 0;
	spawnTimer = 0;
	waveTxt.setText("Wave: " + wave);
}
function endWave() {
	waveInProgress = false;
	nextWaveTimer = 120; // 2 seconds
	gold += 20 + wave * 5;
	goldTxt.setText("Gold: " + gold);
	enemiesPerWave += 1;
	wave += 1;
}
// Main update loop
game.update = function () {
	// Update HP bar position and width
	baseHpBarBg.x = base.x;
	baseHpBarBg.y = base.y - 140;
	baseHpBar.x = base.x - 100;
	baseHpBar.y = base.y - 140;
	baseHpBar.width = 200 * Math.max(0, base.hp) / base.maxHp;
	// Update turrets
	for (var i = 0; i < turrets.length; i++) {
		turrets[i].update();
	}
	// Update enemies
	for (var i = enemies.length - 1; i >= 0; i--) {
		var e = enemies[i];
		e.update();
		// Check if reached base
		if (e.direction === 1 && e.x >= base.x - 90 || e.direction === -1 && e.x <= base.x + 90) {
			base.hp -= 1;
			base.hit();
			e.destroy();
			enemies.splice(i, 1);
			if (base.hp <= 0) {
				LK.effects.flashScreen(0xff0000, 1000);
				LK.showGameOver();
				return;
			}
			continue;
		}
		// Check if dead
		if (e.hp <= 0) {
			e.destroy();
			enemies.splice(i, 1);
			gold += 5;
			goldTxt.setText("Gold: " + gold);
			continue;
		}
	}
	// Update bullets
	for (var i = bullets.length - 1; i >= 0; i--) {
		var b = bullets[i];
		b.update();
		if (b.destroyed) {
			b.destroy();
			bullets.splice(i, 1);
		}
	}
	// Wave logic
	if (waveInProgress) {
		if (enemiesSpawned < enemiesToSpawn) {
			if (spawnTimer <= 0) {
				// Spawn enemy from left or right
				var side = Math.random() < 0.5 ? -1 : 1;
				var e = new Enemy();
				e.direction = side;
				e.x = side === 1 ? 0 : 2048;
				e.y = base.y - 200 + Math.random() * 400;
				e.speed = 3 + wave * 0.3 + Math.random();
				e.hp = 1 + Math.floor(wave / 2);
				enemies.push(e);
				game.addChild(e);
				enemiesSpawned++;
				spawnTimer = 30 + Math.floor(Math.random() * 20);
			} else {
				spawnTimer--;
			}
		} else if (enemies.length === 0) {
			endWave();
		}
	} else {
		if (nextWaveTimer > 0) {
			nextWaveTimer--;
			if (nextWaveTimer === 0) {
				startWave();
			}
		}
	}
};
// Start first wave
startWave();

===================================================================
--- original.js
+++ change.js
@@ -204,8 +204,18 @@
 	width: 200,
 	height: 32,
 	color: 0x44ff44
 });
+// Add ground platform at the bottom of the screen
+var ground = LK.getAsset('base', {
+	anchorX: 0.5,
+	anchorY: 1,
+	x: 2048 / 2,
+	y: 2732,
+	width: 2048,
+	height: 80,
+	color: 0x888888
+});
 game.addChild(ground);
 // GUI
 // HP text removed
 goldTxt = new Text2("Gold: " + gold, {