This app was mentioned in 5 comments, with an average of 2.40 upvotes
Despite being quite old, Danmaku Death is still the best one I've played. It has 31 bosses, can get ridiculously hard, and you can even play as Reimu if you want.
Yeah, I see that too
Is this the right one?
https://play.google.com/store/apps/details?id=jakiganicsystems.danmakudeath