What is the least played game on Steam that you have?

This game is what I have that is the least played. With a 10 player all-time peak, there hasn't been much people playing this. What's sad is that the game is actually fun, has good reviews, and quite new, but I guess Early Access is putting it down. So, as the title says, what do you guys think is the least played game on Steam? Of course, I would prefer if you guys would talk about games that weren't rebooted onto Steam as a way to make more money (you know, games made in the 90's and early 2000's and put onto Steam in recent years), but I can't stop you.

EDIT: I just realized, but no, not the game that you have least played. I mean games that not much people play.