Deep Rock Galactic

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.

"Hey, up for some Deep Rock Galactic?"
"Sure, I can't wait to squish some bugs!"
"Rock and Stone!"