Definitely seems like a solid little one shot, and all the available resources seem like it would be super self contained. I think I’d want a little more detail on the horrors and the source of the famine, plus what the locals believe the source is, to help set up more of the mystery.
Along with that there should be a few more hooks to get into the dungeon area as I feel like it relies on the GM either making the NPC so sketchy as to have the players too quickly guess the next steps, or miss out on it over all.