Very nice core mechanic with mechanics that are forgiving enough that dodging is always up to the player. The bullet patterns are rather uninteresting however, a look into other bullet hells to see how they make bullet patterns interesting could make for nice research.
Also the menus suck. a face is fine for the main boss, but that scribbliness does not translate to good menu design. It's lucky I picked up the controls quick, otherwise I would be utterly clueless.