Really cool game! The time slow mechanic plays really well with the bullet hell genre, especially in the context of this game. I like how the bullets have different behaviors and are easily identifiable. The upgrade system is a cool addition to the game too! At first I didn't really understand what I was upgrading, but I like the trial and error gameplay aspect of the game where you have to try the different powerups and see what they do by experimentation.
Awesome game overall!