Trying to find another great game?

Hey guys my friends and I are big gamers and it seems as tho we are running out of games to play. We play PC and we typically like to play co op survival type games. But really, any game that is fun i will like to know about. We just want a game that you can play for a long time kind of like Terraria(great game by the way) or Dont Starve Together. Any suggestions are welcome and i dont mind buying the game either but free games are great too:)

NOTE: games we've played - Terraria, Dont Starve Together, Minecraft, Portal 2, Unturned, DayZ, Gmod, Chivalry, MW2, Rust, Guns of Icurus, and Monaco.

Thank you for your time!

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