Great game. I love tower defense genre and bullethell games, so I enjoyed this combination.
Art was great and music was good too, but it was a little repetitive.
What the game lacks is a way to slow down the player movement to avoid tighter patterns and it definitely doesn't have enough lives. With movement speed this high it's easy to accidentally run into a bullet and patterns get hard even before wave 5. Because of that I could never test the most expansive tower. And it looked so cool...