Very fun! The concept is simple but good. The music changing per level has pros and cons. On one hand it gives the levels there own vibe and sense of place, on the other hand the levels are so short you don't get to really hear the music. A potential fix for this is to group levels into "zones", where the music changes every 3 or so levels, maybe even the color of the levels, so you still get the changing music but now it has room to breath. The level designs are also good, but on the last level you can leave the main area and go around the perimeter until you reach the goal. Some invisible barriers could fix that. Overall I enjoyed playing, neat little game. Keep it up!