There's not much that can be added on top of the stellar critiques you've received so far, and I won't bore you with technical FFT analysis and stats. Imma just tell ya how I feel about the arrange, and of course take it all with a bucket of salt cuz I'm nobody and this is just my unimportant opinion. ?
It's refreshing to hear a take on 'Blizzard Buffy' that isn't the usual fast paced EDM or Metal. The 'meandering' nature of the piece is part of the charm, and I believe you've achieved a cohesive wintery aesthetic coherent with the theme of the album. The slow building intro and winding outro, on top of setting up the scene properly, also showcase an eye for worldbuilding and composition. As someone who both partake in and appreciate the work that goes into an audiodrama, I give ya props for going the extra mile and adding Buffy's stomps and groans to add context to the arrangement in a way that surely fits this 'filmscore' interpretation.
Now let's talk address the elephant in the room, 3 times heavyweight champion: Mr Glockenspiel. While a fitting instrument choice to an Xmas theme, it has been processed in a way that boosts its natural resonance beyond what a human ear is designed to contain ?. It may or may not be due to the sample itself, but I suspect toning down the salad dressing on the ol' glock would remedy this small, if pivotal inconvenience.
One thing that would greatly help this remix stand out, especially in regard to the genre you're going for, would be to work on strengthening bridges between parts of the track. The piece as a whole proves you've got the arrangement chops to make this a hit. But each transition feels like an afterthought, almost as if you were ice skating from one part of the source to the next. It's never jarring, but if you put the same care/thought into them as you did for the intro and outro, this could truly elevate the whole song. ?
The bombastic middle section from 2:35 onwards sees the return of our favorite superhero, Captain Glockenspiel, which once again shatters my heart by dancing without a care on top of an entire orchestra that is trying its best to convey the source material. It's a bummer because you've clearly put all the stops for this part, and imho this is legitimately well done. But that repeating leitmotiv on glock should be a background dancer, not the vocaloid Diva it's trying to impersonate. I'd also push the thunderous percs back slightly, as they seem to impact overall dynamics, and to let the orchestra breathe so the source melody can properly dominate the soundscape during the fulcrum point, one of the only instance where the audience can hear your interpretation in an uninterrupted sequence.
The last section before the outro features a kick that's (I'm guessing) intentionally simulating a heartbeat and its acceleration as the piece/fight reaches its conclusion. It feels estranged and anachronistic to the rest of the conventional orchestra instruments. Also its overpowering the lows, as any Trap kick should, except in this case the sample's character is clashing with an already busy composition while trying to compensate for the orch lows you didn't write. Otherwise, that section is a wonderful way to wind down before the outro.
All in all, this is a captivating arrangement that confidently tells its story in a brave yet understated way. It only needs a little more love to reach its full potential, and I'm confident you'll get there in no time, with all the great feedback from remixers and staff alike. Gambare VQ! ?