Picking colours from the level is a cool concept, though I'd have liked to see some variation in environment. All the levels being in the same place made the gameplay a bit more limiting. Also, other than the evil version messing up the colours, the difficulty quickly flattened and didn't really change at all, which made me get a bit tired of the mechanics.
Speaking of the evil version, the colour switching is an interesting idea, but the fact that they cycle meant that I spent most of the time just waiting for the colour to go back to what I need it, which made those sections seem more tedious to me than menacing. (Also ran into some bugs there, where the colour on the screen doesn't seem to match the colour I pick from it.)
I would have liked to see this mechanic potentially combined with other mechanics to extend the amount of time it can remain interesting. I think there's good avenues you could get to with this as a core mechanic, but the gameplay here felt like it was missing something?
Anyway, overall an interesting concept that just needed a little bit of something more to make it really shine.