Amazing work here. Very professional sounding and truly captures that nice, frosty feel of the original. (Always liked the work Yamamoto did on this OST)Kudos on making it have something of a progressive feel as well...as if you're travelling through the Drifts.
I will say that initially the choir voice sounded just a TAD robotic, but upon further listening it meshes in nicely (but perhaps adding just a little more decay or... reverb or something couldn't hurt eh?). Nice job, and I look forward to the final version of this one.