Kerbal space program. Its the one game I consistently return to when I'm not in the mood for anything else, and recently I haven't had much time or energy for videogames, so a slow burner like ksp where I can just design crafts after getting home from work, and fly them when I'm off during the weekend has been good.
But damn take2 for what they did to the sequel. I understand it was going to be a Half Life 3 situation with unbelievably high expectations that won't please everyone, but holy shit they could not have failed any harder.