I'm genuinely struggling to find some constructive feedback I can give this other than it's bloody excellent. The only things I can think of are: The controls disappear too quickly, I didn't realise I could switch weapon for ages and round round with no ammo; and that it's really hard to tell what you can walk through and what is solid.
Art is gorgeous, love the character designs. Love you can customise your look. Love the weapons (GAL GUN) and gameplay felt great, if a bit too easy. I got to Wave 11 and decided I probably was never going to die so had to give up I'm afraid haha. Really good work.