This one is great, some fun fairy-tale vibes with a pinch of some eldritch xanthus. The narrative of tragedy, grief and denial runs through this is really strong and is carried throughout the dungeon rooms and environment. The cover illusatration is great (props to Nomski23). The layout and presentation is clear appealing to look at, some good use of text-frames and box-outs to provide separation and contrast.
The map is detailed and well labelled, it took me a moment to parse where the doors were but it was otherwise great. The prose and text as a whole is solidly-written, no real typos but maybe a few double-spaces here and there? I think you could have probably gotten away with making your room keys less wordy and won a bit of breathing room back, but the usage of bullet points makes helps readability a lot. I think the visual effect for blurring Hastur's name is kind of cool, but I think it overlaps with the other text too much and harms the legibility slightly.
I think I'd have like a small section about the monsters/creatures/antagonists present with some system-agnostic indications of stats, from a gaming standpoint it might be a bit vague and requires a little bit more prep-work as is. I think having some defined foes would be fun and make it a bit easier to prep (even if it is simply a rough level/hit dice number and "stats as bear -level"informtion). If stat blocks were included you could probably trim the About the Adventure section: it isn't a bad inclusion, but it probably could have been replaced with either a singular adventure hook (which would incorporate the first paragraph) or perhaps a small table.
This module really is compelling though, I can't wait to give it a try, Excellent work!