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

/**** 
* Classes
****/ 
// Bullet: moves from player to horizon
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGfx = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.z = 0; // 0 = at player, 1 = at horizon
	self.speed = 0.045;
	self.alive = true;
	self.type = 'bullet';
	self.update = function () {
		if (!self.alive) return;
		self.z += self.speed;
		var horizonY = 700;
		var playerY = 2000;
		var centerX = 1024;
		self.x = centerX;
		self.y = horizonY + (playerY - horizonY) * (1 - self.z);
		var minScale = 0.18,
			maxScale = 0.7;
		var scale = minScale + (maxScale - minScale) * (1 - self.z);
		self.scaleX = self.scaleY = scale;
		bulletGfx.alpha = Math.min(1, 0.3 + 0.7 * (1 - self.z));
	};
	self.destroyBullet = function () {
		self.alive = false;
		self.visible = false;
		self.destroy();
	};
	return self;
});
// Enemy approaches from horizon to player
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGfx = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.z = 0; // 0 = at player, 1 = at horizon
	self.speed = 0.008 + Math.random() * 0.004; // z per tick
	self.alive = true;
	self.type = 'enemy';
	// For collision, we use .z and .x
	self.update = function () {
		if (!self.alive) return;
		self.z -= self.speed;
		// Perspective: as z decreases, enemy appears larger and closer to center
		var horizonY = 700;
		var playerY = 2000;
		var centerX = 1024;
		// Lerp position
		self.x = centerX;
		self.y = horizonY + (playerY - horizonY) * (1 - self.z);
		// Lerp scale
		var minScale = 0.25,
			maxScale = 1.2;
		var scale = minScale + (maxScale - minScale) * (1 - self.z);
		self.scaleX = self.scaleY = scale;
		// Fade in as it approaches
		enemyGfx.alpha = Math.min(1, 0.3 + 0.7 * (1 - self.z));
	};
	self.destroyEnemy = function () {
		self.alive = false;
		self.visible = false;
		self.destroy();
	};
	return self;
});
// Jump effect: quick effect at player
var JumpEffect = Container.expand(function () {
	var self = Container.call(this);
	var jumpGfx = self.attachAsset('jumpEffect', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.x = 1024;
	self.y = 2000;
	self.scaleX = 1.1;
	self.scaleY = 1.1;
	jumpGfx.alpha = 0.7;
	tween(self, {
		scaleX: 2,
		scaleY: 2,
		alpha: 0
	}, {
		duration: 220,
		easing: tween.cubicOut,
		onFinish: function onFinish() {
			self.destroy();
		}
	});
	return self;
});
// Muzzle flash: quick effect at player
var MuzzleFlash = Container.expand(function () {
	var self = Container.call(this);
	var muzzleGfx = self.attachAsset('muzzle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.x = 1024;
	self.y = 1850;
	self.scaleX = 1.2;
	self.scaleY = 1.2;
	muzzleGfx.alpha = 0.8;
	// Fade out quickly
	tween(self, {
		scaleX: 2,
		scaleY: 2,
		alpha: 0
	}, {
		duration: 180,
		easing: tween.cubicOut,
		onFinish: function onFinish() {
			self.destroy();
		}
	});
	return self;
});
// Obstacle approaches from horizon to player
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obsGfx = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.z = 0;
	self.speed = 0.009 + Math.random() * 0.003;
	self.alive = true;
	self.type = 'obstacle';
	// Random horizontal offset
	self.offsetX = (Math.random() - 0.5) * 600;
	self.update = function () {
		if (!self.alive) return;
		self.z -= self.speed;
		var horizonY = 700;
		var playerY = 2000;
		var centerX = 1024;
		self.x = centerX + self.offsetX * (1 - self.z);
		self.y = horizonY + (playerY - horizonY) * (1 - self.z);
		var minScale = 0.18,
			maxScale = 1.1;
		var scale = minScale + (maxScale - minScale) * (1 - self.z);
		self.scaleX = self.scaleY = scale;
		obsGfx.alpha = Math.min(1, 0.3 + 0.7 * (1 - self.z));
	};
	self.destroyObstacle = function () {
		self.alive = false;
		self.visible = false;
		self.destroy();
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x181c22
});

/**** 
* Game Code
****/ 
// Enemies: green box, Obstacles: gray box, Bullet: yellow ellipse, Muzzle flash: orange ellipse, Jump effect: blue ellipse, Horizon: thin white box
// Play background music
LK.playMusic('bgmusic');
// Horizon line
var horizonLine = LK.getAsset('horizon', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 1024,
	y: 700
});
game.addChild(horizonLine);
// Crosshair (for visual feedback)
var crosshair = LK.getAsset('crosshair', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 1024,
	y: 1400,
	scaleX: 1,
	scaleY: 1
});
crosshair.alpha = 0.18;
game.addChild(crosshair);
// Score text
var scoreTxt = new Text2('0', {
	size: 120,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Two on-screen buttons: Blue (left), Green (right), small and at the bottom
var btnJump = new Container();
var btnJumpBg = LK.getAsset('jumpEffect', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 0,
	y: 0,
	scaleX: 1.1,
	scaleY: 1.1,
	color: 0x2196F3 // blue
});
btnJumpBg.alpha = 0.85;
btnJump.addChild(btnJumpBg);
btnJump.x = 180;
btnJump.y = 2630;
btnJump.width = btnJumpBg.width * btnJumpBg.scaleX;
btnJump.height = btnJumpBg.height * btnJumpBg.scaleY;
LK.gui.bottom.addChild(btnJump);
var btnShoot = new Container();
var btnShootBg = LK.getAsset('muzzle', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 0,
	y: 0,
	scaleX: 1.1,
	scaleY: 1.1,
	color: 0x43A047 // green
});
btnShootBg.alpha = 0.85;
btnShoot.addChild(btnShootBg);
btnShoot.x = 2048 - 180;
btnShoot.y = 2630;
btnShoot.width = btnShootBg.width * btnShootBg.scaleX;
btnShoot.height = btnShootBg.height * btnShootBg.scaleY;
LK.gui.bottom.addChild(btnShoot);
// Button handlers (re-attach)
btnJump.down = function (x, y, obj) {
	if (isJumping || gameOver) return;
	isJumping = true;
	jumpTicks = 0;
	game.addChild(new JumpEffect());
	LK.getSound('jump').play();
};
btnShoot.down = function (x, y, obj) {
	if (gameOver) return;
	shootBullet();
};
// Game state
var enemies = [];
var obstacles = [];
var bullets = [];
var isJumping = false;
var jumpTicks = 0;
var jumpDuration = 38; // ~0.6s
var spawnTick = 0;
var score = 0;
var gameOver = false;
// Helper: reset game state
function resetGame() {
	for (var i = enemies.length - 1; i >= 0; i--) {
		enemies[i].destroyEnemy();
	}
	for (var i = obstacles.length - 1; i >= 0; i--) {
		obstacles[i].destroyObstacle();
	}
	for (var i = bullets.length - 1; i >= 0; i--) {
		bullets[i].destroyBullet();
	}
	enemies = [];
	obstacles = [];
	bullets = [];
	isJumping = false;
	jumpTicks = 0;
	spawnTick = 0;
	score = 0;
	gameOver = false;
	scoreTxt.setText('0');
}
// Button handlers
btnJump.down = function (x, y, obj) {
	if (isJumping || gameOver) return;
	isJumping = true;
	jumpTicks = 0;
	game.addChild(new JumpEffect());
	LK.getSound('jump').play();
};
btnShoot.down = function (x, y, obj) {
	if (gameOver) return;
	shootBullet();
};
// Also allow whole right/left screen tap for controls
game.down = function (x, y, obj) {
	if (gameOver) return;
	if (x < 1024 && y > 2000) {
		// Left bottom: jump
		btnJump.down(x, y, obj);
	} else if (x >= 1024 && y > 2000) {
		// Right bottom: shoot
		btnShoot.down(x, y, obj);
	}
};
// Shoot bullet
function shootBullet() {
	var b = new Bullet();
	b.z = 0;
	bullets.push(b);
	game.addChild(b);
	game.addChild(new MuzzleFlash());
	LK.getSound('shoot').play();
}
// Spawn enemy or obstacle
function spawnEntity() {
	// 60% enemy, 40% obstacle
	if (Math.random() < 0.6) {
		var e = new Enemy();
		e.z = 1;
		enemies.push(e);
		game.addChild(e);
	} else {
		var o = new Obstacle();
		o.z = 1;
		obstacles.push(o);
		game.addChild(o);
	}
}
// Main update loop
game.update = function () {
	if (gameOver) return;
	// Handle jump
	if (isJumping) {
		jumpTicks++;
		// Animate crosshair up
		crosshair.y = 1400 - 180 * Math.sin(Math.PI * jumpTicks / jumpDuration);
		if (jumpTicks >= jumpDuration) {
			isJumping = false;
			jumpTicks = 0;
			crosshair.y = 1400;
		}
	}
	// Spawn logic: every 60-90 ticks
	spawnTick++;
	if (spawnTick > 60 + Math.random() * 30) {
		spawnEntity();
		spawnTick = 0;
	}
	// Update enemies
	for (var i = enemies.length - 1; i >= 0; i--) {
		var e = enemies[i];
		e.update();
		if (!e.alive) {
			enemies.splice(i, 1);
			continue;
		}
		// If enemy reaches player (z <= 0)
		if (e.z <= 0.04) {
			// If jumping, dodge (score++)
			if (isJumping) {
				LK.getSound('dodge').play();
				score++;
				scoreTxt.setText(score + '');
				e.destroyEnemy();
				enemies.splice(i, 1);
				continue;
			}
			// Not jumping: game over
			LK.getSound('hit').play();
			LK.effects.flashScreen(0xff0000, 900);
			gameOver = true;
			LK.showGameOver();
			return;
		}
	}
	// Update obstacles
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var o = obstacles[i];
		o.update();
		if (!o.alive) {
			obstacles.splice(i, 1);
			continue;
		}
		// If obstacle reaches player (z <= 0.04)
		if (o.z <= 0.04) {
			if (isJumping) {
				// Jumped over: score++
				LK.getSound('dodge').play();
				score++;
				scoreTxt.setText(score + '');
				o.destroyObstacle();
				obstacles.splice(i, 1);
				continue;
			}
			// Not jumping: game over
			LK.getSound('hit').play();
			LK.effects.flashScreen(0xff0000, 900);
			gameOver = true;
			LK.showGameOver();
			return;
		}
	}
	// Update bullets
	for (var i = bullets.length - 1; i >= 0; i--) {
		var b = bullets[i];
		b.update();
		if (!b.alive) {
			bullets.splice(i, 1);
			continue;
		}
		// If bullet reaches horizon, remove
		if (b.z >= 1) {
			b.destroyBullet();
			bullets.splice(i, 1);
			continue;
		}
		// Check collision with enemies (z diff < 0.08, x diff < 120)
		for (var j = enemies.length - 1; j >= 0; j--) {
			var e = enemies[j];
			if (!e.alive) continue;
			if (Math.abs(b.z - e.z) < 0.08 && Math.abs(b.x - e.x) < 120) {
				// Hit!
				LK.effects.flashObject(e, 0xffff00, 200);
				e.destroyEnemy();
				enemies.splice(j, 1);
				b.destroyBullet();
				bullets.splice(i, 1);
				score++;
				scoreTxt.setText(score + '');
				break;
			}
		}
	}
};
// Reset game state on game over
LK.on('gameover', function () {
	resetGame();
});
// Reset game state on win (not used, but for completeness)
LK.on('youwin', function () {
	resetGame();
});

===================================================================
--- original.js
+++ change.js
@@ -199,45 +199,55 @@
 	fill: "#fff"
 });
 scoreTxt.anchor.set(0.5, 0);
 LK.gui.top.addChild(scoreTxt);
-// Two on-screen buttons: Jump (left), Shoot (right)
-var btnJump = new Text2('JUMP', {
-	size: 110,
-	fill: 0x00BFFF
-});
-btnJump.anchor.set(0.5, 0.5);
-btnJump.x = 350;
-btnJump.y = 2500;
-btnJump.bg = LK.getAsset('jumpEffect', {
+// Two on-screen buttons: Blue (left), Green (right), small and at the bottom
+var btnJump = new Container();
+var btnJumpBg = LK.getAsset('jumpEffect', {
 	anchorX: 0.5,
 	anchorY: 0.5,
 	x: 0,
 	y: 0,
-	scaleX: 2.2,
-	scaleY: 2.2
+	scaleX: 1.1,
+	scaleY: 1.1,
+	color: 0x2196F3 // blue
 });
-btnJump.bg.alpha = 0.18;
-btnJump.addChild(btnJump.bg);
+btnJumpBg.alpha = 0.85;
+btnJump.addChild(btnJumpBg);
+btnJump.x = 180;
+btnJump.y = 2630;
+btnJump.width = btnJumpBg.width * btnJumpBg.scaleX;
+btnJump.height = btnJumpBg.height * btnJumpBg.scaleY;
 LK.gui.bottom.addChild(btnJump);
-var btnShoot = new Text2('SHOOT', {
-	size: 110,
-	fill: 0xFFB300
-});
-btnShoot.anchor.set(0.5, 0.5);
-btnShoot.x = 2048 - 350;
-btnShoot.y = 2500;
-btnShoot.bg = LK.getAsset('muzzle', {
+var btnShoot = new Container();
+var btnShootBg = LK.getAsset('muzzle', {
 	anchorX: 0.5,
 	anchorY: 0.5,
 	x: 0,
 	y: 0,
-	scaleX: 2.2,
-	scaleY: 2.2
+	scaleX: 1.1,
+	scaleY: 1.1,
+	color: 0x43A047 // green
 });
-btnShoot.bg.alpha = 0.18;
-btnShoot.addChild(btnShoot.bg);
+btnShootBg.alpha = 0.85;
+btnShoot.addChild(btnShootBg);
+btnShoot.x = 2048 - 180;
+btnShoot.y = 2630;
+btnShoot.width = btnShootBg.width * btnShootBg.scaleX;
+btnShoot.height = btnShootBg.height * btnShootBg.scaleY;
 LK.gui.bottom.addChild(btnShoot);
+// Button handlers (re-attach)
+btnJump.down = function (x, y, obj) {
+	if (isJumping || gameOver) return;
+	isJumping = true;
+	jumpTicks = 0;
+	game.addChild(new JumpEffect());
+	LK.getSound('jump').play();
+};
+btnShoot.down = function (x, y, obj) {
+	if (gameOver) return;
+	shootBullet();
+};
 // Game state
 var enemies = [];
 var obstacles = [];
 var bullets = [];