Very nice game, too bad there's a lack of sfx.
In my opinion, in a bullet hell like this, a sort of ability to become invincible for a short moment would make the game more skill based, instead of being unlucky that there are thousands of bullets flying and having essentially zero room to dodge anywhere.
Also playing in full screen essentially put me in a disadvantage, since enemies would spawn outside of the invisible walls and shoot me while I couldn't reach them.
Still very cool, thanks for creating.