A very engaging Idea. While the beginning was a bit weird sounding harmonicly, it evolved pretty well! I did somewhat get reminded of some old Tim Burton Movies. However I do believe that your chosen difficulty is wrongly chosen, since for dificulty C it needed to sound 1:1 forward and backwars (whitch a Piano for eg. can't do). Also, I seem to miss your second song, or is this a typo?
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On your Submissoun page is an info of how many songs are submitted. This info will be given by you while filling up the submission formular. On there it states you have 2 songs. But it might be a typo. It happens to anybody. On my first submission I've inadvertently disable downloads for the first days and havn't posted additional Links. So it could be worse ^^.