The game was super well polished. The different color palettes were a great idea for accessibility and the music was lovely. Level design was really cool too. I felt like there was a good flow to it.

My only nitpicks were that the controls were a tad difficult to use for me. I think changing ZX to JK or something of the sort so I can use both hands and I was a bit annoyed with the wall jump happening when I wanted to just jump on top of something.

Great use of color shifting as a mechanic! Love the color scheme options as well, especially since I'm color blind!
At times, the shifting was only hard because my hand was trying to do too much at the same time.
My only suggestion, for what I was able to completed, is a simple accessibility functionality to allow both shift and ctrl keys to perform the color shift ability. Since you already allow both sides of the keyboard for movement, it would make sense. But also for those who are opposite handed and don't use WASD.