Deep Rock Galactic is a 1-4 player co-op fps that is about fully randomized cave systems, mining, and killing aliens, it is one of the most complete indie games I have played in years and is just a masterpiece, it is free this weekend and on sale for 35% off, I really recommend trying it on Steam! Also gets regular content updates.
STEAM page: https://store.steampowered.com/app/5...Rock_Galactic/
Really good fan made trailer: https://youtu.be/8B4jxKmh2Pk
Great review: https://youtu.be/wVKi6HWg-ec