Switching colors didn't really work for me but the concept seems cool. Works fine on my Arch Linux x86_64 install

Neat idea. I like the challenge of changing colors to match the incoming enemies. It can be a bit awkward with the controls though, maybe if the mouse button would shoot instead of space.

FYI: The game wouldn't start if I opened it in a folder with a space in the name

Arch Linux (x86_64), throws error: https://hastebin.com/osomoxeceq.sql