Pretty cool simple game!
The visuals for shooting colors and retrieving them are very satisfying, when its fun to do with such a simple look, you know you've done it right.
This game would really benefit from more HUD elements, like showing what colors you have, always showing which you'll shoot. Also showing the reload time for Right-Click. Would make the mechanics a lot quicker to understand.
Good level design for the limited mechanics, with some good developments of those mechanics. (Moving colors behind a wall, having multiple of the same color)
Nicely done!