I love this concept of changing colors to affect us (the player) as well as our environments! I feel that you implemented this concept really well to fit in with the limitation! The level design was super enjoyable to play through, especially the bonus level! The visuals are super cute and neat, the animations are fun, and the music fits in well with the created aesthetic!
Something that I would have liked to see is an indicator of some sort on the UI to know what color we are on, and which one we will cycle into if we click Mouse Button 1 or Mouse Button 2, but maybe that's just because my peanut brain can't retain the order of colors, ahaha~ ^^a
All in all, you have created a very fun, visually appealing game with a great concept and a very good use of the limitation! Be proud of a job well done!! ^^