Well, it was very strange and one of a kind piece. Haven't really heard anything like this before.
The beginning was very eerie. But the piano in the seond part was strange. Sounded offtune a bit. From my point it almost ruined it.
It was rather diverse though. Tempo changes were good effect. The third part completely threw me off though. Almost that it could be its own song. It was a bit of a contrast.
Try and smooth out the transition, put a bit of mastering work, and you may have a good piece here.