I would also say that most of the walking simulators that where mentioned here:
My mentions would be The Last of Us, Spec Ops: The Line and Amnesia: The Dark Descent. Also The Stanley Parable depending on what you consider "completing" that game.
League of Legends: I try to get diamond before Riot removes Linux support.
Mushy Score: I a lot of testing before releasing the game.
Spiritfarer: Just to have something relaxing alternative.