This game was pretty fun. I would suggest adding some music and sfx so things don't feel so quiet. I would also maybe gradually increase the rate of fire per wave, so things don't start off hard. I like the powerups and how it changes your shape and allows you to be hit a couple of times before dying completely. I did get an error message when I hit an enemy after getting through a couple of waves, it wasn't super clear on what it was about though. All in all, a good game with potential.