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

/**** 
* Classes
****/ 
// Arena border (visual only)
var ArenaBorder = Container.expand(function () {
	var self = Container.call(this);
	var border = self.attachAsset('arenaBorder', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	border.alpha = 0.7;
	return self;
});
// Bullet class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletSprite = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.vx = 0;
	self.vy = 0;
	self.update = function () {
		self.x += self.vx;
		self.y += self.vy;
	};
	return self;
});
// Soul (player) class
var Soul = Container.expand(function () {
	var self = Container.call(this);
	var soulSprite = self.attachAsset('soul', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// For hit flash
	self.flash = function () {
		tween(self, {
			alpha: 0.3
		}, {
			duration: 80,
			onFinish: function onFinish() {
				tween(self, {
					alpha: 1
				}, {
					duration: 120
				});
			}
		});
	};
	return self;
});

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

/**** 
* Game Code
****/ 
// Arena dimensions (centered)
// Heart-shaped soul (red)
// Arena border (white rectangle, thin)
// Bullet (white circle)
// Enemy warning (yellow, for telegraphing)
var ARENA_W = 1200;
var ARENA_H = 900;
var ARENA_X = 2048 / 2 - ARENA_W / 2;
var ARENA_Y = 2732 / 2 - ARENA_H / 2;
// Add arena border
var arenaBorder = new ArenaBorder();
arenaBorder.x = 2048 / 2;
arenaBorder.y = 2732 / 2;
game.addChild(arenaBorder);
// Add soul (player)
var soul = new Soul();
soul.x = 2048 / 2;
soul.y = 2732 / 2;
game.addChild(soul);
// GUI: Timer (shows wave time left)
var timerTxt = new Text2('', {
	size: 80,
	fill: "#fff"
});
timerTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(timerTxt);
// GUI: Wave counter
var waveTxt = new Text2('', {
	size: 80,
	fill: "#fff"
});
waveTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(waveTxt);
waveTxt.y = 90;
// Game state
var bullets = [];
var currentWave = 0;
var waveTime = 0;
var waveTimer = 0;
var waveActive = false;
var soulAlive = true;
var dragSoul = false;
var dragOffsetX = 0;
var dragOffsetY = 0;
// Arena bounds (for clamping soul)
function clampSoul(x, y) {
	var hw = 50,
		hh = 50; // soul half size
	var minX = ARENA_X + hw;
	var maxX = ARENA_X + ARENA_W - hw;
	var minY = ARENA_Y + hh;
	var maxY = ARENA_Y + ARENA_H - hh;
	return {
		x: Math.max(minX, Math.min(maxX, x)),
		y: Math.max(minY, Math.min(maxY, y))
	};
}
// Touch/drag controls
function handleSoulMove(x, y, obj) {
	if (!dragSoul || !soulAlive) return;
	var pos = clampSoul(x - dragOffsetX, y - dragOffsetY);
	soul.x = pos.x;
	soul.y = pos.y;
}
game.move = function (x, y, obj) {
	handleSoulMove(x, y, obj);
};
game.down = function (x, y, obj) {
	// Only start drag if inside soul
	var dx = x - soul.x,
		dy = y - soul.y;
	if (dx * dx + dy * dy <= 60 * 60) {
		dragSoul = true;
		dragOffsetX = x - soul.x;
		dragOffsetY = y - soul.y;
		handleSoulMove(x, y, obj);
	}
};
game.up = function (x, y, obj) {
	dragSoul = false;
};
// Waves definition
// Each wave: {duration, spawnFunc(tick, bulletsArr)}
var waves = [
// Wave 1: Simple slow bullets from top
{
	duration: 180,
	// 3s
	spawnFunc: function spawnFunc(tick, arr) {
		if (tick % 30 === 0) {
			// Wave 1: slow bullets
			var speed = 6;
			for (var i = 0; i < 4; ++i) {
				var b = new Bullet();
				b.x = ARENA_X + 200 + i * 250;
				b.y = ARENA_Y + 30;
				b.vx = 0;
				b.vy = speed;
				arr.push(b);
				game.addChild(b);
			}
		}
	}
},
// Wave 2: Bullets from left/right
{
	duration: 210,
	// 3.5s
	spawnFunc: function spawnFunc(tick, arr) {
		if (tick % 24 === 0) {
			// S-shape: bullets from left and right, with vy oscillating as a sine wave
			var speed = 10;
			var amplitude = 60; // increased vertical amplitude of S
			var freq = 0.12; // increased frequency of S
			// Left to right
			var b1 = new Bullet();
			b1.x = ARENA_X + 30;
			b1.y = ARENA_Y + 150 + tick % 2 * 400;
			b1.vx = speed;
			b1.vy = amplitude * Math.sin((tick + 0) * freq);
			// Store phase for S motion
			b1._sPhase = (tick + 0) * freq;
			b1._sDir = 1;
			// Override update for S shape
			b1._baseY = b1.y;
			b1._baseX = b1.x;
			b1._t = 0;
			b1.update = function () {
				this.x += this.vx;
				this._t += 1;
				// S shape: y = baseY + amplitude * sin((x - baseX) * freq)
				this.y = this._baseY + amplitude * Math.sin((this.x - this._baseX) * freq);
			};
			arr.push(b1);
			game.addChild(b1);
			// Right to left
			var b2 = new Bullet();
			b2.x = ARENA_X + ARENA_W - 30;
			b2.y = ARENA_Y + 750 - tick % 2 * 400;
			b2.vx = -speed;
			b2.vy = amplitude * Math.sin((tick + 60) * freq);
			b2._sPhase = (tick + 60) * freq;
			b2._sDir = -1;
			b2._baseY = b2.y;
			b2._baseX = b2.x;
			b2._t = 0;
			b2.update = function () {
				this.x += this.vx;
				this._t += 1;
				this.y = this._baseY + amplitude * Math.sin((this.x - this._baseX) * freq);
			};
			arr.push(b2);
			game.addChild(b2);
		}
	}
},
// Wave 3: Diagonal bullets from corners
{
	duration: 240,
	// 4s
	spawnFunc: function spawnFunc(tick, arr) {
		if (tick % 36 === 0) {
			// Wave 3: diagonal, medium speed
			var speed = 7.5;
			var diag = speed / Math.sqrt(2);
			// Top-left
			var b1 = new Bullet();
			b1.x = ARENA_X + 40;
			b1.y = ARENA_Y + 40;
			b1.vx = diag;
			b1.vy = diag;
			arr.push(b1);
			game.addChild(b1);
			// Top-right
			var b2 = new Bullet();
			b2.x = ARENA_X + ARENA_W - 40;
			b2.y = ARENA_Y + 40;
			b2.vx = -diag;
			b2.vy = diag;
			arr.push(b2);
			game.addChild(b2);
			// Bottom-left
			var b3 = new Bullet();
			b3.x = ARENA_X + 40;
			b3.y = ARENA_Y + ARENA_H - 40;
			b3.vx = diag;
			b3.vy = -diag;
			arr.push(b3);
			game.addChild(b3);
			// Bottom-right
			var b4 = new Bullet();
			b4.x = ARENA_X + ARENA_W - 40;
			b4.y = ARENA_Y + ARENA_H - 40;
			b4.vx = -diag;
			b4.vy = -diag;
			arr.push(b4);
			game.addChild(b4);
		}
	}
},
// Wave 4: Random rain
{
	duration: 210,
	// 3.5s
	spawnFunc: function spawnFunc(tick, arr) {
		if (tick % 10 === 0) {
			// Wave 4: fast random rain
			var minSpeed = 12,
				maxSpeed = 16;
			var b = new Bullet();
			b.x = ARENA_X + 80 + Math.floor(Math.random() * (ARENA_W - 160));
			b.y = ARENA_Y + 30;
			b.vx = 0;
			b.vy = minSpeed + Math.random() * (maxSpeed - minSpeed);
			arr.push(b);
			game.addChild(b);
		}
	}
},
// Wave 5: Spiral (center out)
{
	duration: 270,
	// 4.5s
	spawnFunc: function spawnFunc(tick, arr) {
		if (tick % 12 === 0) {
			// Wave 5: spiral, moderate speed
			var speed = 9;
			var angle = tick / 12 * 0.5;
			for (var i = 0; i < 4; ++i) {
				var a = angle + i * Math.PI / 2;
				var b = new Bullet();
				b.x = 2048 / 2;
				b.y = 2732 / 2;
				b.vx = Math.cos(a) * speed;
				b.vy = Math.sin(a) * speed;
				arr.push(b);
				game.addChild(b);
			}
		}
	}
}];
// Start first wave
function startWave(idx) {
	currentWave = idx;
	waveTime = 0;
	waveActive = true;
	waveTimer = 0;
	// Remove all bullets
	for (var i = bullets.length - 1; i >= 0; --i) {
		bullets[i].destroy();
		bullets.splice(i, 1);
	}
	// Update GUI
	waveTxt.setText("Wave " + (currentWave + 1) + "/" + waves.length);
}
startWave(0);
// Main update loop
game.update = function () {
	if (!soulAlive) return;
	// Wave logic
	if (waveActive) {
		var wave = waves[currentWave];
		wave.spawnFunc(waveTime, bullets);
		waveTime++;
		// Update timer GUI
		var tleft = Math.max(0, Math.ceil((wave.duration - waveTime) / 60));
		timerTxt.setText("Time: " + tleft + "s");
		// End wave?
		if (waveTime >= wave.duration) {
			waveActive = false;
			// Remove all bullets after short delay
			LK.setTimeout(function () {
				for (var i = bullets.length - 1; i >= 0; --i) {
					bullets[i].destroy();
					bullets.splice(i, 1);
				}
				// Next wave or win
				if (currentWave + 1 < waves.length) {
					startWave(currentWave + 1);
				} else {
					// Win!
					LK.showYouWin();
				}
			}, 600);
		}
	}
	// Update bullets
	for (var i = bullets.length - 1; i >= 0; --i) {
		var b = bullets[i];
		b.update();
		// Remove if out of arena (immediately on leaving the border)
		if (b.x < ARENA_X || b.x > ARENA_X + ARENA_W || b.y < ARENA_Y || b.y > ARENA_Y + ARENA_H) {
			b.destroy();
			bullets.splice(i, 1);
			continue;
		}
		// Collision with soul
		var dx = b.x - soul.x,
			dy = b.y - soul.y;
		if (dx * dx + dy * dy < 45 * 45) {
			// Hit!
			soul.flash();
			soulAlive = false;
			LK.effects.flashScreen(0xff0000, 800);
			LK.setTimeout(function () {
				LK.showGameOver();
			}, 600);
			break;
		}
	}
};
// Initial GUI text
timerTxt.setText("Time: ");
waveTxt.setText("Wave 1/" + waves.length);

===================================================================
--- original.js
+++ change.js
@@ -177,10 +177,10 @@
 	spawnFunc: function spawnFunc(tick, arr) {
 		if (tick % 24 === 0) {
 			// S-shape: bullets from left and right, with vy oscillating as a sine wave
 			var speed = 10;
-			var amplitude = 6; // vertical amplitude of S
-			var freq = 0.045; // frequency of S
+			var amplitude = 60; // increased vertical amplitude of S
+			var freq = 0.12; // increased frequency of S
 			// Left to right
 			var b1 = new Bullet();
 			b1.x = ARENA_X + 30;
 			b1.y = ARENA_Y + 150 + tick % 2 * 400;
@@ -196,9 +196,9 @@
 			b1.update = function () {
 				this.x += this.vx;
 				this._t += 1;
 				// S shape: y = baseY + amplitude * sin((x - baseX) * freq)
-				this.y = this._baseY + amplitude * Math.sin((this.x - this._baseX) * 0.045);
+				this.y = this._baseY + amplitude * Math.sin((this.x - this._baseX) * freq);
 			};
 			arr.push(b1);
 			game.addChild(b1);
 			// Right to left
@@ -214,9 +214,9 @@
 			b2._t = 0;
 			b2.update = function () {
 				this.x += this.vx;
 				this._t += 1;
-				this.y = this._baseY + amplitude * Math.sin((this.x - this._baseX) * 0.045);
+				this.y = this._baseY + amplitude * Math.sin((this.x - this._baseX) * freq);
 			};
 			arr.push(b2);
 			game.addChild(b2);
 		}