This caught my eye during the flood of E3 videos, and I watched @BrianRubin play a bit of it a few weeks ago. It is currently in Early Access (Closed Alpha) with a planned 2018 release date.
Join a team of badass space dwarves in this stylish 1-4 player co-op FPS. Fight, dig and explore your way through enormous procedurally generated cave systems, uncover the riches, and make it out alive…
Brian’s stream of the game from back in June: