Barotrauma.Everyone is part of the crew in a submarine underwater in the seas of the new inhabited planet and they have to accomplish some sort of mission each time - transfering cargo to the destination, shooting down a monster and then going to the destination, or carrying an artifact from an underwater alien base then going to the destination.Heavily inspired by Space Station 13.Max per 'match' can be 16, 1-2 servers usually available (including an unofficial 24/7 server) and average 6-ish players online. Bots only available in singleplayer, spawnable in multiplayer but they can't get ordered there. Bots' intelligence is so-and-so and gets orders to do various jobs on the ship.
I used to host a server daily for that game, the free to play aspect just draws in stuffters and russians (who are almost always stuffters),
Ace of Spades retail.