===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,315 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+// Bullet class
+var Bullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bulletGfx = self.attachAsset('bullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = -60; // Upwards, fast
+	self.active = true;
+	self.update = function () {
+		if (!self.active) return;
+		self.y += self.speed;
+	};
+	return self;
+});
+// Gun class (player's shooter)
+var Gun = Container.expand(function () {
+	var self = Container.call(this);
+	var gunGfx = self.attachAsset('gun', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.gfx = gunGfx;
+	// Gun barrel position (for bullet spawn)
+	self.getBarrel = function () {
+		// Barrel is at center top of gun
+		return {
+			x: self.x,
+			y: self.y - gunGfx.height / 2
+		};
+	};
+	return self;
+});
+// Tile class (falling note)
+var Tile = Container.expand(function () {
+	var self = Container.call(this);
+	var tileGfx = self.attachAsset('tile', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.gfx = tileGfx;
+	self.speed = 0; // Set per tile
+	self.hit = false;
+	self.update = function () {
+		if (self.hit) return;
+		self.y += self.speed;
+	};
+	// Flash tile when hit
+	self.flashHit = function () {
+		self.hit = true;
+		tween(self.gfx, {
+			tint: 0xffe100
+		}, {
+			duration: 80,
+			onFinish: function onFinish() {
+				tween(self.gfx, {
+					tint: 0x00eaff
+				}, {
+					duration: 120
+				});
+			}
+		});
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
+	backgroundColor: 0x0a0a1a
+});
+
+/**** 
+* Game Code
+****/ 
+// Music: EDM track (looping)
+// Sound: tile hit
+// Sound: gunfire
+// Bullet
+// Gun (player's shooter)
+// Tiles (falling notes)
+// --- Game constants ---
+var GAME_W = 2048,
+	GAME_H = 2732;
+var GUN_Y = GAME_H - 320;
+var TILE_ROWS = 4; // Number of tile lanes
+var TILE_LANE_W = GAME_W / TILE_ROWS;
+var TILE_SPAWN_Y = -60;
+var TILE_TARGET_Y = GAME_H - 520; // Where tiles should be hit
+var TILE_SPEED = 22; // px per frame (tuned for rhythm)
+var TILE_INTERVAL = 32; // frames between tiles (tuned for rhythm)
+var BULLET_SPEED = -60;
+var BULLET_FIRE_INTERVAL = 6; // frames between bullets when holding
+var HIT_WINDOW = 90; // px vertical window for hit
+var GUN_MOVE_LIMIT = 180; // px from screen edge
+// --- Game state ---
+var gun;
+var tiles = [];
+var bullets = [];
+var score = 0;
+var lastFireTick = 0;
+var isFiring = false;
+var dragGun = false;
+var dragOffsetX = 0;
+var dragOffsetY = 0;
+var tickCount = 0;
+var nextTileTick = 0;
+var tilePattern = []; // Array of {lane, tick}
+var patternIndex = 0;
+var gameOver = false;
+// --- UI ---
+var scoreTxt = new Text2('0', {
+	size: 120,
+	fill: 0xFFFFFF
+});
+scoreTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreTxt);
+// --- Music ---
+LK.playMusic('edm1');
+// --- Helper: Generate a simple rhythm pattern (random for now) ---
+function generatePattern() {
+	// For MVP: 64 tiles, random lanes, evenly spaced
+	tilePattern = [];
+	var t = 0;
+	for (var i = 0; i < 64; i++) {
+		var lane = Math.floor(Math.random() * TILE_ROWS);
+		tilePattern.push({
+			lane: lane,
+			tick: t
+		});
+		t += TILE_INTERVAL;
+	}
+}
+// --- Helper: Spawn a tile at a given lane ---
+function spawnTile(lane) {
+	var tile = new Tile();
+	tile.x = TILE_LANE_W * (lane + 0.5);
+	tile.y = TILE_SPAWN_Y;
+	tile.speed = TILE_SPEED;
+	tile.lane = lane;
+	tile.hit = false;
+	tiles.push(tile);
+	game.addChild(tile);
+}
+// --- Helper: Fire a bullet from gun towards a lane ---
+function fireBullet() {
+	var barrel = gun.getBarrel();
+	var bullet = new Bullet();
+	bullet.x = barrel.x;
+	bullet.y = barrel.y;
+	bullet.speed = BULLET_SPEED;
+	bullets.push(bullet);
+	game.addChild(bullet);
+	LK.getSound('gunfire').play();
+}
+// --- Helper: Check if bullet hits a tile ---
+function checkBulletTileCollision(bullet, tile) {
+	// Only check if tile not hit
+	if (tile.hit) return false;
+	// Check if bullet and tile are in same lane (x overlap)
+	var dx = Math.abs(bullet.x - tile.x);
+	if (dx > TILE_LANE_W / 2 - 30) return false;
+	// Check if bullet is within hit window (y)
+	var dy = Math.abs(bullet.y - tile.y);
+	if (dy < HIT_WINDOW) return true;
+	return false;
+}
+// --- Helper: End game ---
+function endGame() {
+	if (gameOver) return;
+	gameOver = true;
+	LK.effects.flashScreen(0xff0033, 800);
+	LK.showGameOver();
+}
+// --- Helper: Win game ---
+function winGame() {
+	if (gameOver) return;
+	gameOver = true;
+	LK.effects.flashScreen(0x00ff99, 800);
+	LK.showYouWin();
+}
+// --- Initialize game objects ---
+function resetGame() {
+	// Remove all tiles and bullets
+	for (var i = 0; i < tiles.length; i++) tiles[i].destroy();
+	for (var i = 0; i < bullets.length; i++) bullets[i].destroy();
+	tiles = [];
+	bullets = [];
+	score = 0;
+	scoreTxt.setText('0');
+	tickCount = 0;
+	nextTileTick = 0;
+	patternIndex = 0;
+	gameOver = false;
+	isFiring = false;
+	dragGun = false;
+	// Gun
+	if (gun) gun.destroy();
+	gun = new Gun();
+	gun.x = GAME_W / 2;
+	gun.y = GUN_Y;
+	game.addChild(gun);
+	// Pattern
+	generatePattern();
+}
+resetGame();
+// --- Input: Drag to move gun, hold to fire ---
+game.down = function (x, y, obj) {
+	// Only allow drag if touch is on gun or below
+	if (y >= gun.y - gun.gfx.height / 2 - 60) {
+		dragGun = true;
+		dragOffsetX = x - gun.x;
+		dragOffsetY = y - gun.y;
+		isFiring = true;
+		// Fire immediately
+		fireBullet();
+		lastFireTick = tickCount;
+	}
+};
+game.move = function (x, y, obj) {
+	if (dragGun) {
+		// Clamp gun movement to screen
+		var nx = x - dragOffsetX;
+		nx = Math.max(GUN_MOVE_LIMIT, Math.min(GAME_W - GUN_MOVE_LIMIT, nx));
+		gun.x = nx;
+	}
+};
+game.up = function (x, y, obj) {
+	dragGun = false;
+	isFiring = false;
+};
+// --- Main game loop ---
+game.update = function () {
+	if (gameOver) return;
+	tickCount++;
+	// --- Spawn tiles according to pattern ---
+	while (patternIndex < tilePattern.length && tilePattern[patternIndex].tick <= tickCount) {
+		spawnTile(tilePattern[patternIndex].lane);
+		patternIndex++;
+	}
+	// --- Move tiles ---
+	for (var i = tiles.length - 1; i >= 0; i--) {
+		var tile = tiles[i];
+		tile.update();
+		// Missed tile? (passed target line)
+		if (!tile.hit && tile.y > TILE_TARGET_Y + HIT_WINDOW) {
+			endGame();
+			return;
+		}
+		// Remove tile if off screen
+		if (tile.y > GAME_H + 100) {
+			tile.destroy();
+			tiles.splice(i, 1);
+		}
+	}
+	// --- Fire bullets if holding ---
+	if (isFiring && tickCount - lastFireTick >= BULLET_FIRE_INTERVAL) {
+		fireBullet();
+		lastFireTick = tickCount;
+	}
+	// --- Move bullets ---
+	for (var i = bullets.length - 1; i >= 0; i--) {
+		var bullet = bullets[i];
+		bullet.update();
+		// Remove bullet if off screen
+		if (bullet.y < -100) {
+			bullet.destroy();
+			bullets.splice(i, 1);
+			continue;
+		}
+		// Check collision with tiles
+		for (var j = 0; j < tiles.length; j++) {
+			var tile = tiles[j];
+			if (checkBulletTileCollision(bullet, tile)) {
+				// Hit!
+				tile.flashHit();
+				LK.getSound('tilehit').play();
+				score += 1;
+				scoreTxt.setText(score);
+				bullet.active = false;
+				bullet.destroy();
+				bullets.splice(i, 1);
+				// Remove tile after short delay
+				(function (tileObj) {
+					LK.setTimeout(function () {
+						tileObj.destroy();
+						var idx = tiles.indexOf(tileObj);
+						if (idx !== -1) tiles.splice(idx, 1);
+					}, 80);
+				})(tile);
+				// Win condition
+				if (score >= tilePattern.length) {
+					winGame();
+				}
+				break;
+			}
+		}
+	}
+};
+// --- Reset game on game over/win ---
+LK.on('gameover', function () {
+	resetGame();
+});
+LK.on('youwin', function () {
+	resetGame();
 });
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