Very good work! I love the concept with RGB.
Entering the keys to change the color or colors, in addition to having to move is not obvious. At least after a few tries it couldn't be any problem and it's squarely fun.
I was just a little disappointed that it didn't save my best score which was around 400. After that I find that it lacks an increasing difficulty according to for example: slices of 100 points.
Add either enemy speed or in larger numbers. Because, I have the impression that it is relatively constant and that there is no real progression. Unless, also to make levels with waves.
Audio feedback would be welcome. I like the ability to get off the screen for past and avoid. It's cool to see the enemies following us. As for the weapon and the projectiles. I wonder if it wouldn't be better to pop them out from the end of the cannon instead.