Small issue: the text size is kind of off in Chrome on Mac OS.

Nice job with this!  The platforming mechanics are smooth and fun, and the color-dipping to change abilities was creative.  The puzzles all worked well, I encountered no bugs in the mechanics/puzzles, and I completed the game.  Your size-of-character-to-world ratio worked very well, and you also provided many boards to play in this game, which is great.  The music and art are also nice -- are they your original art/music?

Some feedback I hope is helpful:  1. the UI could use some adjustments, most notably the square in the upper right showing what each character-color signifies.  In various parts of the game, this box covered up terrain, the key, my player (when I walked under it), and if I recall correctly, the door, so that was a problem.  The two colors are straightforward, so I think you can delete that box entirely, and just tell the player what the colors are on the first board in which they appear.  (In fact, before the color-dipping appeared, that box confused me).  There were also some apparent artifacts on some boards that were confusing because they did nothing -- e.g., a purple character (I thought I'd be able to switch to it or something), a white symbol that looks like a volume icon, etc.  These look like things you were testing and forgot to delete.  And finally, the instruction texts early in the game were in different font sizes from board to board (making them uniform will give a cleaner appearance) and sometimes the white text blended with the white background.

2.  Challenge level is always going to depend on your user, I know, but fwiw I thought you could significantly ramp up the challenge as the game progressed to make it more fun.  I thought both the platforming (I only died 2-3 times total, I think) and puzzles would be improved with more difficulty.

I hope this is helpful, great work!!