This is a good game! I think the take on the theme is pretty good too. I just have one tiny remark: A and D keys are working but not the W. Either make them all work or remove the A and D keys. I also encountered that in another game so maybe it's some predefined settings from Unity or something...
Anyway, good work!
Edit: Also you could improve the game by giving a color-blind options (I don't expect that from a Jam game but it could be a fine addition) and using forms instead of colors.