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

/**** 
* Classes
****/ 
// Obstacle class: moves downward, destroys itself off-screen
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obstacleSprite = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Speed (randomized)
	self.speed = 10 + Math.random() * 8;
	// For collision detection
	self.obstacleSprite = obstacleSprite;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Player class: follows mouth position, shows shield if mouth open
var Player = Container.expand(function () {
	var self = Container.call(this);
	// Player body
	var playerSprite = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Shield (hidden by default)
	var shieldSprite = self.attachAsset('shield', {
		anchorX: 0.5,
		anchorY: 0.5,
		alpha: 0.0
	});
	// Show/hide shield
	self.setShield = function (active) {
		if (active) {
			shieldSprite.alpha = 0.5;
		} else {
			shieldSprite.alpha = 0.0;
		}
	};
	// For collision detection, expose playerSprite and shieldSprite
	self.playerSprite = playerSprite;
	self.shieldSprite = shieldSprite;
	return self;
});
// Point class: moves downward, destroys itself off-screen
var Point = Container.expand(function () {
	var self = Container.call(this);
	var pointSprite = self.attachAsset('point', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Speed (slower than obstacles)
	self.speed = 7 + Math.random() * 4;
	// For collision detection
	self.pointSprite = pointSprite;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	// No title, no description
	// Always backgroundColor is black
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
// Point: yellow ellipse
// Obstacle: red box
// Shield: semi-transparent cyan ellipse, slightly larger
// Player character: blue ellipse
// Game area: 2048x2732
// Player starts at center
var player = new Player();
player.x = 2048 / 2;
player.y = 2732 * 0.7;
game.addChild(player);
// Score display
var score = 0;
var scoreTxt = new Text2('0', {
	size: 120,
	fill: 0xFFF700
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Lives display
var lives = 3;
var livesTxt = new Text2('❤❤❤', {
	size: 90,
	fill: 0xFF3333
});
livesTxt.anchor.set(0.5, 0);
LK.gui.topRight.addChild(livesTxt);
// Arrays for obstacles and points
var obstacles = [];
var points = [];
// Timers for spawning
var obstacleTimer = 0;
var pointTimer = 0;
// Invulnerability after hit
var invulnTicks = 0;
var INVULN_DURATION = 60; // 1 second at 60fps
// Helper: update lives text
function updateLivesText() {
	var s = '';
	for (var i = 0; i < lives; i++) s += '❤';
	livesTxt.setText(s);
}
// Helper: clamp player position inside game area
function clampPlayerPosition() {
	var r = 100;
	if (player.x < r) player.x = r;
	if (player.x > 2048 - r) player.x = 2048 - r;
	if (player.y < r + 100) player.y = r + 100; // avoid top menu
	if (player.y > 2732 - r) player.y = 2732 - r;
}
// Main update loop
game.update = function () {
	// 1. Update player position from facekit
	var mouth = facekit.mouthCenter;
	if (mouth && typeof mouth.x === 'number' && typeof mouth.y === 'number') {
		// Smooth follow
		player.x += (mouth.x - player.x) * 0.35;
		player.y += (mouth.y - player.y) * 0.35;
		clampPlayerPosition();
	}
	// 2. Shield: mouth open
	var shieldActive = !!facekit.mouthOpen;
	player.setShield(shieldActive);
	// 3. Spawn obstacles
	obstacleTimer--;
	if (obstacleTimer <= 0) {
		var obs = new Obstacle();
		obs.x = 180 + Math.random() * (2048 - 360);
		obs.y = -80;
		obstacles.push(obs);
		game.addChild(obs);
		// Next spawn: 30-60 ticks
		obstacleTimer = 30 + Math.floor(Math.random() * 30);
	}
	// 4. Spawn points
	pointTimer--;
	if (pointTimer <= 0) {
		var pt = new Point();
		pt.x = 180 + Math.random() * (2048 - 360);
		pt.y = -60;
		points.push(pt);
		game.addChild(pt);
		// Next spawn: 80-160 ticks
		pointTimer = 80 + Math.floor(Math.random() * 80);
	}
	// 5. Update obstacles
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obs = obstacles[i];
		obs.update();
		// Remove if off-screen
		if (obs.y > 2732 + 100) {
			obs.destroy();
			obstacles.splice(i, 1);
			continue;
		}
		// Collision with player
		var collides = obs.obstacleSprite.intersects(player.playerSprite);
		if (collides) {
			if (shieldActive || invulnTicks > 0) {
				// Blocked: flash obstacle, destroy
				tween(obs.obstacleSprite, {
					alpha: 0
				}, {
					duration: 200,
					onFinish: function onFinish() {
						obs.destroy();
					}
				});
				obstacles.splice(i, 1);
				continue;
			} else {
				// Hit: lose life, invuln, flash player
				lives--;
				updateLivesText();
				invulnTicks = INVULN_DURATION;
				LK.effects.flashObject(player, 0xff0000, 600);
				if (lives <= 0) {
					LK.effects.flashScreen(0xff0000, 1000);
					LK.showGameOver();
					return;
				}
				// Remove obstacle
				obs.destroy();
				obstacles.splice(i, 1);
				continue;
			}
		}
	}
	// 6. Update points
	for (var j = points.length - 1; j >= 0; j--) {
		var pt = points[j];
		pt.update();
		// Remove if off-screen
		if (pt.y > 2732 + 80) {
			pt.destroy();
			points.splice(j, 1);
			continue;
		}
		// Collision with player
		var collides = pt.pointSprite.intersects(player.playerSprite);
		if (collides) {
			// Collect point
			score += 1;
			LK.setScore(score);
			scoreTxt.setText(score);
			// Flash point
			tween(pt.pointSprite, {
				alpha: 0
			}, {
				duration: 200,
				onFinish: function onFinish() {
					pt.destroy();
				}
			});
			points.splice(j, 1);
			continue;
		}
	}
	// 7. Invulnerability timer
	if (invulnTicks > 0) {
		invulnTicks--;
		// Flicker player
		player.playerSprite.alpha = invulnTicks % 8 < 4 ? 0.4 : 1.0;
	} else {
		player.playerSprite.alpha = 1.0;
	}
};
// On game start, reset everything
function resetGame() {
	score = 0;
	LK.setScore(0);
	scoreTxt.setText('0');
	lives = 3;
	updateLivesText();
	invulnTicks = 0;
	// Remove all obstacles and points
	for (var i = 0; i < obstacles.length; i++) obstacles[i].destroy();
	for (var j = 0; j < points.length; j++) points[j].destroy();
	obstacles = [];
	points = [];
	// Reset player position
	player.x = 2048 / 2;
	player.y = 2732 * 0.7;
	player.setShield(false);
}
resetGame();
// No touch/mouse controls needed; all via facekit
// End of MVP

===================================================================
--- original.js
+++ change.js
@@ -70,9 +70,11 @@
 /**** 
 * Initialize Game
 ****/ 
 var game = new LK.Game({
-	backgroundColor: 0x181c2c
+	// No title, no description
+	// Always backgroundColor is black
+	backgroundColor: 0x000000
 });
 
 /**** 
 * Game Code