Hello Crane,
I have solved this entire pack. My replays are attached. Nothing too difficult here, since this pack is simply a compilation of various snow/holiday levels from various authors. I have already played both Lemmings Stampede and Minim's holiday pack from a while ago, and so all their levels that are in this pack I have already seen and solved before. I've just recently finished LPing Clammings, and so all of Clam's levels in here I have just played not too long ago. The only levels I haven't seen or don't ever remember playing are Xmas 1 - House of Holly, Xmas 4 - Out with the old..., Xmas 11 - Fall Guy, Xmas 20 - Faithful Friends, Xmas 21 - Vignette, Xmas 26 - Someone must help us!, Xmas 29 - Christmas Spirit, and Xmas 30 - Hailfire Peaks. I've seen Xmas 4 before in the Lemmini topic, but I don't think I ever played uci's level. It's possible that I might have played Xmas 11, Xmas 20, Xmas 21, and Xmas 26 before, but I honestly don't remember. The layouts for them do look familiar, though.
The hardest levels for me were Xmas 13 - That Freezing Feeling and Xmas 24 - Ethereality. The former I don't remember how I solved it before, but I remember it was annoying to pull off on Dos. I think my solution is a backroute, as I have some skills leftover. I don't remember if I solved it this way on Dos. The latter's a really nice level with a great solution, although it's not that easy to find. I don't remember where I have seen and played this level before. The only other level that isn't difficult but is probably the biggest time cruncher in the entire pack is Xmas 26.
All rightie, I think I'm done playing Christmas packs for the rest of the year, as I recently did both of Gigalem's Holiday packs and now this. That's enough for me. Thank you for the holiday cheers, all of you. Happy early Christmas, everyone!