I found myself enjoying this more than I initially thought I would. Shifting the color tones around to dynamically change the environment was really clever. The signpost that explains it was very welcome because I was confused until I read it. It's a hard game to put down because it makes you want to push on and see what's coming next, which is good design.
If I was going to nit-pick I would say using a, d for left, right and space for jump feels a little awkward, but I understand why seems you use the mouse as well. Other than that, I had fun. Great entry!