I guess I have some small nitpicks. The drums are mostly underwhelming, like they could be more interesting. They mostly loop the same patterns, and are generally kind of quiet too. I almost feel like the song would be better without them.
I also felt like the song was very sparse. If you just would have had piano, that would have been fine (assuming you made the dynamics work to your advantage). But once you introduce rock drums, I start wanting other elements - particularly, I REALLY want a nice pad to fill out the song.
As a minor complaint, I felt like the call and response in the first half of the song e.g. :59 doesn't work, because the high piano is too quiet.
Alright, all complaints are now out of the way. I thought you did really good! Sorry as usual for grousing, but I really did enjoy this cover. The combination of the different themes was well done, and the transitions were nice. I almost didn't even notice them, heh. :)
Good job!