Deep Rock Galactic, developed by Ghost
Ship Games, is a recently released
steam game that, for once, wasn't a poorly made early access cash grab. It is a co-op first person waveshooter where you play as dwarfs mining in the caves of an
alien planet.
The game heavily emphasizes teamwork and is great fun to play, especially with friends. A good game to compare it to would be Left 4 Dead.
Oh, and its soundtrack is godly.