===================================================================
--- original.js
+++ change.js
@@ -1,11 +1,11 @@
 var HeroBullet = Container.expand(function () {
 	var self = Container.call(this);
 	var bulletGraphics = LK.getAsset('heroBullet', 'Hero Bullet Graphics', 0.5, 0.5);
 	self.addChild(bulletGraphics);
-	self.speed = -5;
+	self.speed = 10;
 	self.move = function () {
-		self.y += self.speed;
+		self.y -= self.speed;
 	};
 });
 var EnemyBullet = Container.expand(function () {
 	var self = Container.call(this);
@@ -187,9 +187,9 @@
 		if (allEnemiesKilled) {
 			currentWave++;
 			spawnWave();
 		}
-		if (LK.ticks % 30 === 0) {
+		if (LK.ticks % 15 === 0) {
 			fireHeroBullet();
 		}
 		enemies.forEach(function (enemy, index) {
 			if (LK.ticks % 90 === 0) {