Amazing game. I do say that the shield powerup might be a bit broken, especially if you find it early on. But that is a very minor gripe. More annoying was how sharp the opening music was, which made it uncomfortable to listen to.
Sorry about the music. Hopefully the sound controls made it easy to adjust it to a more comfortable volume. The shield is intentionally OP to give you the sense of power of the enemy if you use it strategically but I understand where your coming from. Thanks for playing!