I really love the cold rules presented here both for climbing the mountain and the actual rules for dealing with cold.
The dungeon is interesting and has some challenges that are pretty fun. From a mechanical perspective everything works really well, but from a narrative perspective I have a lot of questions.
What is the hook? Why would anyone scale this dangerous mountain to reach this church? Where is the infinite supply of frozen deathless coming from? What is the Mizer doing here? Why does it matter?
I know that a map was probably excluded to the page restriction, but it would have been really useful. It took me quite awhile to put together how the church encounter flows, which is silly in retrospect considered how few rooms there are. I mean there are just 2 right. But I think that illustrates how confusing it is until you put it all together. Aside from those minor complaints and a few grammatical and spelling errors that stuck out, this is pretty awesome stuff.