Could add some sound, maybe allow us to use flight on the ship instead of being stuck in one place shooting, I'm in a spaceship, this isn't missile command.
You've got the general enemies require specific color of bullets which is good, but I'm thinking that the control scheme isn't exactly user friendly. Can I make a few suggestions.
If you remain stationary then maybe you should have it so we can switch between arrow keys and wasd.
3/5 and 6/10.
Early, but with promise.
This has potential to be a GREAT game, but the lack of sound seriously depletes the action. I suggest adding a sound effect at least when you shoot down an enemy. Till then the core game mechanics are pretty solid, but lacking. 6/10 3/5