I really wish you could jump with W (or up). Pressing the space bar feels a bit awkward because you also have to use the mouse. But maybe that's just a personal preference.
It took me quite a while to get past the snake. The platform mechanics could be worked on a bit more. At the beginning I didn't notice that I was generating them at the bottom of the screen. But maybe that's just because of the limited time and the looming deadline.
The idea that you can manipulate the world by recolouring it is great. And I like the design, it's cute. Good luck with future development. You are on your way to an interesting game. :)