Dwarves are always digging too deep. There's plenty of fun, pulpy encounters here and the minecart puzzle is a clever way to get the party to explore and think about the environment. It's smart to let the core rules do the heavy lifting for stat blocks to save space. I wish there were a few more omens hinting at the statue to help players understand what's going on, and I think some of the neutral NPCs should have been given stronger motivations (especially since this is intended as a one-shot). Otherwise, the layout is easy to follow and covers a lot of material. Thank you for sharing your project.