I really liked this "aha" moment on the pit level, when you have to combine the colors. First, I tried to jump over the bridge (as for a usual platformer) but kept dying over and over again until I found out that I can combine the color. The idea fits well the theme and seems quite fresh. Also, the controls are satisfying, so good job on this one. If you used pre-existing assets, you could also add a few background elements, without them the game feels somewhat empty. Overall, a solid entry.