Thanks for playing and for the long feedback!
Each weapon has a utility, but in this version only blue and purple are enough. For example: the green shields you, the cyan regen your health.
Purple is indeed really op in this xD, I planned to add more enemy types so the other weapons could make sense. But unfortunately I had lost the first 12h of jam, so it is what it is.
Never considered add each button shoot a weapon because I wanted to have the color mix as gameplay too. And yeah, would be easier too.
I'm happy that you liked it! :D