The first thing I noticed at least was that when I started the game, the window size was too long so I could not see the bottom of the screen and my character. That was fixed with Alt+Enter to enter full screen.
Apart from that, really fun game that forces the player to both dodge and trying to hit the same colored enemies to become smaller so you can get a higher score.
Fitting chiptune music that doesn't get annoying (yet).
Simple to understand and very fun!