I've only played this game a little bit, but it's hard to imagine a song so beautiful in it...going to have to check out the original now.
I feel like the piano was a bit too low in register, could probably move everything up an octave (except for the intro, maybe). Sometimes the strings sounded like they were a bit behind in the attack envelope.
Your "dumb" voice is pretty amazing. Great expression and phrasing. The slight delay was a nice touch for some of the more intense sections, hardly noticeable but it definitely added to the atmosphere. What was that pad you added at the end? Could use some more of that...
This review might have been too serious, my bad.