Very nice and feels very polished. A bit too much stuff on screen, but it's not annoying, so no complaints there. Very wacky bosses.
It's a bit less like a touhou shmup and more like a gladius shmup, which I assume is the inspiration. My only feedback would be - all characters feel the same - the only difference I found were the bullet patterns (which are not very distinguishable, and I found the beam consistently more useful), and a tiny speed change between the left guy and everybody else.