Very difficult, took a while to get the hang of it.
One complaint is how easily you die and the level gets restarted - I've heard just the same beginning of the track non stop now while trying to figure out the game.
The submission closed just before I could upload the change to randomize the starting track :( It is fairly difficult but I feel the balance is p good once you get into it, just the song is supposed to be random so the restarts are less repetitive.