Well, I gotta admit the authors' sincerity: This is not an easy platformer! Normally it wouldn't seem hard, but with each level new rules are added, like "dont walk left". So it becomes much more challenging.
I wasn't a big fan of the main palette or music, but the gfx are nicely drawn and animated, plus the gameplay is mostly nailed correctly. Props to the authors for getting out their thinking caps and coming up with new ideas (instead of just inventing a gimmick, this can only grab your attention as a player for some time) and building levels that make good use of them (something like games like color theory above kinda fails to do).