This is a really great adventure to lay down between two other locations. I think the mechanics for hypothermia are excellent, but don't feel overly punishing, but they also provide a compelling reason to go into this strange obviously problematic inn.
A lot of the random encounters really make the bog feel like a living place. The peat moose, the grappling peat beneath the snow, even the ainking into the bog and grasping hoarfrost. I love it. I might need to plug this in somewhere in my game.
My constructive criticism is that it is indeed very hard to read. The font choice, although thematic and cool makes this problem worse. I had to take time just to parse where to start, and to identify the important points, or even which bits are different sections.
The placement of the Swamp Moose stat block right under a reference in blue and bold to the ice cellar was really confusing. I was like, is the swamp moose more than a random encounter?
I think the sections need more delineation, an easier to read font and maybe more liberal use of bold, italics, and colors to pull out the important information. I would usually suggest simplifying the language and parsing the words down to the most important elements, but in your case I find the language so evocative I'd hate for you to lose that.
On an entirety different point, I think the hag needs to have some kind of magic (maybe she's supposed to use her own herbal concoctions?), but her stat block really reads like a melee encounter and I feel like that isn't the feel you're going for with that adversary.
Overall, after parsing this one, I think it is one of my favorites, but my immediate reaction was to dislike it because it felt needlessly overwhelming.