Had some good fun!
Here is what I think :
1. The art was solid! But sometimes it was a little hard to spot the character when the background was the same color as the tiles.
2. The use of duality here is perfect, but the limitation seems to have been an afterthought. Still, I think it's pretty funny that you need to find the word "enerything"! :T
3. I believe the idea of changing color to match the background could have been even stronger if the game included platforms or mechanics that would change depending on your color. Definitely some potential there!
4 . 1000 factorial cookies is way to many by the way! :P
Thanks for the game! Hope you score well!