Wow.
I'm pretty familiar with the original, and this is beautifully orchestrated, without a doubt. You used the piano extremely well, in the context of the full orchestra. Your use of layering, especially in the strings, is excellent, and the chord at 1:11 was a wonderful surprise— I would guess you have practice writing real orchestra pieces before...
My only complaint is that the sort of "canned" sound that many orchestral VSTs have is especially obvious in a piece using only orchestra— and especially in a piece that would obviously sound amazing played by real performers. This would undoubtedly be breathtaking played by a live orchestra... not that you necessarily have access to a private orchestra, of course. Anyway, I only took off half a star for that because I so desperately wanted to hear real instruments, but that's not really your fault.
Overall, I'm very impressed, and thrilled that a piece like this can get featured on Newgrounds amid all the dubstep and more dubstep and even more dubstep. I'd love to see what else you can do with the orchestra in the future. Keep it up!
-Miyo