I like the concept, a musical platformer, but the way notes activated was a little confusing, like the sliding notes. And it was not clear your character had double jumps nor wall-jumps, other than finding it by trial/error. The jump from level 1 to 2 was too big also.
Still, I can see there's ground to make it both a fast-paced musical "meatboy" style game. Or a slower puzzle-focus game.