Super cool shooter, neat mechanics, some small issues though but nothing major.
I'd say the main issue is the speedy movement that make it hard to navigate some of the more tight bullet patterns then again i'll admit i'm no bullet hell expert :P
Other than that it's really well made, the pixel art is beautiful, mouse aiming is always a must when you have free rotation (a crosshair would have been nice though) I liked the very clean UI, the fact that you indicated the enemies hp by having them changing color, and also the fact that even if you kept the default buttons you laid out your menus very well, too bad there is no audio at all :(
Cool game anyway congrats ! :)