Pretty fun idea, and fits the theme too.
I really like how the game is about optimizing you color balance rather than having a lose condition.
I think the game could really use some audio, but I understand how hard it is to get everything done in just 4 days so prioritizing the gameplay make sense.
Also, it would be nice to be able to "wrap" around the map, like if you keep going left you eventually loop around to the right.
Good job on the game !