A dungeoncrawl with a mission and variable timer. Looks like good old-school fun to me. I do think there's a good chance that the magma might rise to level 3 too quickly, which I presume kills the prisoners? I'm also worried that the map might be a little too linear to allow PCs to sneak their way around the cultists if they choose. The original beasties, the urn-ghouls, and the soot-lurker are pretty cool. There's a lot to like here!
Viewing post in Beneath the Shivering Mountain jam comments
Thanks for the feedback! I realized there were some missing connections on my map and the routes in/out weren't marked, which I think reduces the linearity. I also had cut the description of the exterior which hints at the second entrance, which I've now added back in. I do agree though, it turned out more linear than I wanted / expected.
On the magma level rising, it will never actually inundate level 3, although I can see where the confusion comes from. I added some notes to the delving rules section to hopefully clarify.
Looking forward to reading your entry!