Such a fun time! There were multiple points where I squealed in delight when finding out the details of a new mechanic. Each new color is really, really tight in how it combines with the others, and I loved the satisfaction of pulling off a tight move. A lot of the same satisfaction/pride as, say, finishing a good Meat Boy level. Really tight. A little tough on the one hand, though. I would maybe consider having one other optional control scheme in addition to the default one---there were definitely multiple points where I felt I would have had a more comfortable or satisfying time with, say, the arrow keys for movement while the left hand controlled the colors (or movement with left hand and each arrow key mapped to a color?). Really amazing work! 

Gameplay really well thought ! Woud've been a good entry for Metroidvania month

This was really solid. A basic metroidvania that's well executed. using different velocities and jump heights for each color, to complete differing platforming challenges was a fun twist
One note: When clicking start in stead of new game on the first time playing, that crashes the game. Maybe greying that out until a save exists would be a way to avoid confusion.

Nicely done and solid game play. Just a bit difficulty getting it to start (Mac / Linux) - Other than that, it’s all good.