I like the color mechanic and it made great use of the color palette. Controls were a bit confusing as I tried playing with the controller but it didn't seem like there was a way to change colors using the controller, and couldn't figure out how to do some things with the keyboard - jump or shoot, I forgot which - so it made me awkwardly switch between controller and mouse/kb combo while playing. There's definitely a lot of potential with the color mechanic though and I could see this being expanded into a metroidvania where different colors have different properties and you unlock them as you progress.