Incredibly polished, snappy and beautiful.
Feedback (these mostly come in problems; suggested fixes are rather useless as I don't know the game as well as the devs):
- The doors unlocking after clearing a room feels too slow.
- Enemy bullets are a little hard to see when there are flashing effects around. (not enough contrast?)
- Regarding the enemy that shoots a ring of eight bullets upon death, it doesn't feel good to dash correctly into the ring just to go too far and hit the bullet on the other side of the ring because it didn't travel fast enough. (maybe they could travel faster? or there might be a better solution...)
PS: I personally enjoy the purely horizontal shooting, it makes the game feel more unique.