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

/**** 
* Classes
****/ 
var Bird = Container.expand(function () {
	var self = Container.call(this);
	// Attach a simple ellipse as the bird
	var birdAsset = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Bird physics
	self.y = 1200;
	self.x = 600;
	self.velocityY = 0;
	self.gravity = 2.5;
	self.flapStrength = -38;
	// Track lastY for possible future use
	self.lastY = self.y;
	// Update method: apply gravity and move bird
	self.update = function () {
		self.lastY = self.y;
		// Only apply gravity and movement if the game has started
		if (typeof gameStarted === "undefined" || !gameStarted) {
			return;
		}
		self.velocityY += self.gravity;
		self.y += self.velocityY;
		// Bird looks up when going up, down when falling
		// Clamp rotation between -0.5 (up) and 0.5 (down) radians for a nice diagonal look
		if (self.velocityY < -5) {
			self.rotation = -0.5;
		} else if (self.velocityY > 5) {
			self.rotation = 0.5;
		} else {
			self.rotation = self.velocityY / 10; // smooth transition between -0.5 and 0.5
			if (self.rotation < -0.5) self.rotation = -0.5;
			if (self.rotation > 0.5) self.rotation = 0.5;
		}
		// Prevent bird from going above the screen
		if (self.y < birdAsset.height / 2) {
			self.y = birdAsset.height / 2;
			self.velocityY = 0;
		}
		// Prevent bird from falling below the screen
		if (self.y > 2732 - birdAsset.height / 2) {
			self.y = 2732 - birdAsset.height / 2;
			self.velocityY = 0;
		}
	};
	// Flap method: called on tap
	self.flap = function () {
		self.velocityY = self.flapStrength;
	};
	return self;
});
// Cloud class for moving clouds across the screen
var Cloud = Container.expand(function () {
	var self = Container.call(this);
	// Attach cloud asset
	var cloudAsset = self.attachAsset('cloud', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 0.6,
		scaleY: 0.6
	});
	// Set initial position and speed
	self.x = 2048 + 200; // Start just off the right edge
	// Allow clouds to spawn anywhere vertically, including near the top and bottom
	self.y = Math.random() * (2732 - cloudAsset.height) + cloudAsset.height / 2;
	// 40% chance to be a fast cloud
	if (Math.random() < 0.4) {
		self.speed = 10 + Math.random() * 3; // Faster cloud
	} else {
		self.speed = 5 + Math.random() * 3; // Faster normal cloud
	}
	self.lastX = self.x;
	self.update = function () {
		self.lastX = self.x;
		// Only move if gameStarted is true
		if (typeof gameStarted !== "undefined" && gameStarted) {
			self.x -= self.speed;
		}
		// If cloud moves off left edge, reset to right
		if (self.x < -cloudAsset.width / 2) {
			self.x = 2048 + cloudAsset.width / 2;
			// Allow clouds to respawn anywhere vertically, including near the top and bottom
			self.y = Math.random() * (2732 - cloudAsset.height) + cloudAsset.height / 2;
			// 40% chance to be a fast cloud
			if (Math.random() < 0.4) {
				self.speed = 10 + Math.random() * 3; // Faster cloud
			} else {
				self.speed = 5 + Math.random() * 3; // Faster normal cloud
			}
		}
	};
	return self;
});
// Hat class for moving hats across the screen
var Hat = Container.expand(function () {
	var self = Container.call(this);
	// Attach a hat asset (use a box as a placeholder, or replace with a hat image asset if available)
	var hatAsset = self.attachAsset('box', {
		width: 120,
		height: 80,
		color: 0x222222,
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Start just off the right edge
	self.x = 2048 + 100;
	// Random vertical position, but not too close to the top/bottom
	self.y = 400 + Math.random() * (2732 - 800);
	self.speed = 12;
	self.lastX = self.x;
	self.update = function () {
		self.lastX = self.x;
		self.x -= self.speed;
		// If hat moves off left edge, reset to right and randomize y
		if (self.x < -100) {
			self.x = 2048 + 100;
			self.y = 400 + Math.random() * (2732 - 800);
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
// Add background image behind the bird
var background = LK.getAsset('background', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 0
});
game.addChild(background);
// Score variables
var survivalTime = 0; // in seconds
// Import storage plugin for persistent best score
// Best score persistent storage
var bestScore = storage.bestScore || 0;
// Best score text at top center
var bestScoreText = new Text2('BEST: ' + bestScore, {
	size: 100,
	fill: "#fff"
});
bestScoreText.anchor.set(0.5, 0); // center-top
LK.gui.top.addChild(bestScoreText);
// Current score at top right
var scoreText = new Text2('0', {
	size: 100,
	fill: "#fff"
});
scoreText.anchor.set(1, 0); // right-top
LK.gui.topRight.addChild(scoreText);
// Add clouds behind the bird, but only after 3 seconds from first tap
var clouds = [];
var cloudsSpawned = false;
function spawnClouds(numClouds) {
	if (cloudsSpawned && typeof numClouds === "undefined") return;
	if (typeof numClouds === "undefined") numClouds = 3;
	// If clouds already spawned, only add new clouds if needed
	if (clouds.length < numClouds) {
		for (var i = clouds.length; i < numClouds; i++) {
			var cloud = new Cloud();
			cloud.x = 2048 + 200;
			clouds.push(cloud);
			game.addChild(cloud);
		}
	}
	cloudsSpawned = true;
}
// Create the bird and add to the game
var bird = new Bird();
game.addChild(bird);
// Create hats array, but do not spawn hats until game starts
var hats = [];
var hatsSpawned = false;
function spawnHats() {
	if (hatsSpawned) return;
	hatsSpawned = true;
	// Spawn multiple hats for increased challenge, all at the right edge after 3 seconds
	for (var i = 0; i < 1; i++) {
		var hat = new Hat();
		// All hats spawn at the right edge (2048 + 100)
		hat.x = 2048 + 100;
		// Randomize y position for each hat
		hat.y = 400 + Math.random() * (2732 - 800);
		hats.push(hat);
		game.addChild(hat);
	}
}
// Game state: wait for first tap to start
var gameStarted = false;
var scoreTimer = null;
// Show "Tap to Start" text at the center of the screen until the game starts
var tapToStartText = new Text2('Tap to Start', {
	size: 160,
	fill: "#fff"
});
tapToStartText.anchor.set(0.5, 0.5);
LK.gui.center.addChild(tapToStartText);
// Tap anywhere to start the game and make the bird flap
game.down = function (x, y, obj) {
	if (!gameStarted) {
		gameStarted = true;
		// Remove "Tap to Start" text
		if (tapToStartText && tapToStartText.parent) {
			tapToStartText.parent.removeChild(tapToStartText);
		}
		// Start score timer
		scoreTimer = LK.setInterval(function () {
			survivalTime += 1;
			LK.setScore(survivalTime);
			scoreText.setText(survivalTime);
		}, 1000);
		// Spawn clouds and hats immediately
		var initialClouds = 3 + Math.floor(survivalTime / 5);
		spawnClouds(initialClouds);
		spawnHats();
	}
	if (gameStarted) {
		bird.flap();
		LK.getSound('flap').play();
	}
};
// Update clouds every frame
game.update = function () {
	if (!gameStarted) {
		return;
	}
	if (cloudsSpawned) {
		for (var i = 0; i < clouds.length; i++) {
			clouds[i].update();
			// Check for collision between bird and cloud
			if (clouds[i].lastWasIntersecting === undefined) clouds[i].lastWasIntersecting = false;
			var nowIntersecting = bird.intersects(clouds[i]);
			if (!clouds[i].lastWasIntersecting && nowIntersecting) {
				// Stop score timer
				if (scoreTimer) LK.clearInterval(scoreTimer);
				// Update best score if needed
				if (survivalTime > bestScore) {
					bestScore = survivalTime;
					storage.bestScore = bestScore;
					bestScoreText.setText('BEST: ' + bestScore);
				}
				// Set score to survival time for game over screen
				LK.setScore(survivalTime);
				// Show game over screen
				// Bird dies: rotate and fall
				bird.velocityY = 30;
				bird.gravity = 6;
				// Change bird visual to bird2
				if (bird.children && bird.children.length > 0) {
					var oldBirdAsset = bird.children[0];
					var idx = bird.getChildIndex(oldBirdAsset);
					bird.removeChild(oldBirdAsset);
					var bird2Asset = bird.attachAsset('bird2', {
						anchorX: 0.5,
						anchorY: 0.5
					});
					bird2Asset.x = 0;
					bird2Asset.y = 0;
					bird.addChildAt(bird2Asset, idx);
				}
				if (bird.rotationTween) tween.stop(bird, {
					rotation: true
				});
				bird.rotationTween = tween(bird, {
					rotation: Math.PI / 2
				}, {
					duration: 500
				});
				LK.showGameOver();
				return;
			}
			clouds[i].lastWasIntersecting = nowIntersecting;
		}
	}
	// Update hats and check for collision with bird, only if hats have spawned
	if (hatsSpawned) {
		for (var h = 0; h < hats.length; h++) {
			hats[h].update();
			if (hats[h].lastWasIntersecting === undefined) hats[h].lastWasIntersecting = false;
			var hatNowIntersecting = bird.intersects(hats[h]);
			if (!hats[h].lastWasIntersecting && hatNowIntersecting) {
				// Increase score by 1 for each hat collected
				survivalTime += 1;
				LK.setScore(survivalTime);
				scoreText.setText(survivalTime);
				// Flash hat red for 400ms
				LK.effects.flashObject(hats[h], 0xff0000, 400);
				// Increase clouds every 5 points
				if (survivalTime % 5 === 0) {
					spawnClouds(3 + Math.floor(survivalTime / 5));
				}
			}
			hats[h].lastWasIntersecting = hatNowIntersecting;
		}
	}
	// Check for collision with top or bottom of the screen
	var birdAssetHeight = 200; // matches bird asset height
	if (bird.lastY > birdAssetHeight / 2 && bird.y <= birdAssetHeight / 2 || bird.lastY < 2732 - birdAssetHeight / 2 && bird.y >= 2732 - birdAssetHeight / 2) {
		if (scoreTimer) LK.clearInterval(scoreTimer);
		// Update best score if needed
		if (survivalTime > bestScore) {
			bestScore = survivalTime;
			storage.bestScore = bestScore;
			bestScoreText.setText('BEST: ' + bestScore);
		}
		LK.setScore(survivalTime);
		// Bird dies: rotate and fall
		bird.velocityY = 30;
		bird.gravity = 6;
		// Change bird visual to bird2
		if (bird.children && bird.children.length > 0) {
			var oldBirdAsset = bird.children[0];
			var idx = bird.getChildIndex(oldBirdAsset);
			bird.removeChild(oldBirdAsset);
			var bird2Asset = bird.attachAsset('bird2', {
				anchorX: 0.5,
				anchorY: 0.5
			});
			bird2Asset.x = 0;
			bird2Asset.y = 0;
			bird.addChildAt(bird2Asset, idx);
		}
		if (bird.rotationTween) tween.stop(bird, {
			rotation: true
		});
		bird.rotationTween = tween(bird, {
			rotation: Math.PI / 2
		}, {
			duration: 500
		});
		LK.showGameOver();
		return;
	}
};

===================================================================
--- original.js
+++ change.js
@@ -30,8 +30,19 @@
 			return;
 		}
 		self.velocityY += self.gravity;
 		self.y += self.velocityY;
+		// Bird looks up when going up, down when falling
+		// Clamp rotation between -0.5 (up) and 0.5 (down) radians for a nice diagonal look
+		if (self.velocityY < -5) {
+			self.rotation = -0.5;
+		} else if (self.velocityY > 5) {
+			self.rotation = 0.5;
+		} else {
+			self.rotation = self.velocityY / 10; // smooth transition between -0.5 and 0.5
+			if (self.rotation < -0.5) self.rotation = -0.5;
+			if (self.rotation > 0.5) self.rotation = 0.5;
+		}
 		// Prevent bird from going above the screen
 		if (self.y < birdAsset.height / 2) {
 			self.y = birdAsset.height / 2;
 			self.velocityY = 0;