It's my favorit one so far because it is finishable, yet I had to figure out how to collect certain coins without it getting annoying to do so. What really bothered me was the low framerate and the music loop. I don't even understand how you could get to below 25 FPS. Isn't that more work to actually achieve? Also when you decide to write a 4-Chord song in double time, add a good melody. This 10 second loop almost made me go insane.
I think your intention was to increase the difficulty of each level which would go against the idea of randomly getting an order assigned. Fortunately, they weren't that much different in difficulty, apart from the first level.
Movement is nice and hitting the coins works well too. Thanks for the game! :)