“Core Keeper is a 1-8 player co-op sandbox adventure with mining, crafting, building, fighting, and farming elements. It is in development by Pugstorm (Radical Rabbit Stew) with publishing by Sold Out (Mechwarrior 5: Mercenaries, Disjunction, KeyWe). It is now available for Open Alpha via requesting access from the Steam store page. Currently, Pugstorm is planning for an early 2022 release but as always that is subject to change.” Jordan @ Thumb Culture
Source: N4G PC Core Keeper Preview – Thumb Culture