Techtonica on Steam
store.steampowered.com
Techtonica is a first-person factory automation game set beneath the surface of an alien planet. Work alone or in co-op to build factories, gather resources, research new technologies, mold the destructible terrain, establish a base of operations, and uncover long-forgotten secrets.

Tried the demo a few months back and it was super promising. The devs seem like wonderful people too. They’re a small team and I’d love to see them get some support and for Techtonica to be a success!