I saw TooLoo's comment after trying it myself and trying to figure out what to do. You would have to memorize the colorwheel and even then im not sure I understood what I had to do in the game. I would definitely start by putting the colorwheel in the game in the background so the player could see it, then maybe a little tutorial or just the text of the color selected with a hint of what color you should switch to shoot. Definitely a mechanic I have not seen before. Good job!