@eniko Alone in the Dark.

... Wait, you said chill games, not games that give you chills, sorry.

Crystal Pixels is originally a DOS game/simulation, and aside from the rather unusual controls it's pretty chill. Jones in the Fast Lane is turn based and there's a one player mode where you can try to make progress at your own pace. Animal Quest is rather simple, but you get to learn a few things about animals along the way.