It has a procedurally-generated open world with towns and NPCs to talk to, all the resource gathering, mining, crafting stuff you'd expect in a modern survival game, and some good old fashioned dungeon crawling to boot.
I've been working on it off and on for the last several months. It's complete up through the Bronze Age (in Valheim terms). Let me know what you think!
Early on, I actually used a bunch of tiles that I had lifted straight from Ultima V, but I swapped them all out for my own work once it looked like the game was fun and I might want to actually show it in public one day.