The cover is great. It's a weird dungeon crawl. I'd love to see more NPCs and non-combat encounters. It could use a few hooks as to why they PCs would go there.
I don't really care about PC hooks in adventures and I try to build most of the encounters in an old school way, so in most of them you can try to reason with the guys or find alternative ways to pass. I wanted to make some npc minisheets but run out of space. Thanks for your time!