I really like the concept and vibe of this adventure. It has a good balance of challenge, treasure, and environmental storytelling. A few evocative descriptions as well that set a consistent and engaging mood. I like the doodle art and the maps. I think this aesthetic is great and probably underused in recent OSR work (which tends to be glossy and kind of same-y). Gameplay-wise, there is good navigation, exploration, investigation, and combat challenge. I wish there was one more thing to talk to in this dungeon but that might just be a personal nitpick.

My biggest critique is that the presentation style sometimes hinders my understanding. Bullet points are great but I wish the room keys started with initial impressions (i.e., a short description of the things that would jump out to the PCs upon first entering the room). This would also benefit from some styling (e.g., bolding the names of monsters in the keys to let the GM know they might act against the PCs). Finally, the margins of the PDFs are very small making the text feel cramped at times. Having said all that, it is still readable and I really enjoyed reading it. 

Fun, would run.