Exo One is an easy recommend from me. Easily the most calm and soothing game I have ever played and it helped me get through some tough and difficult times of my life like when a close family member of mine passed away in July of 2022. The game is a UFO flight simulator with an ambient-like soundtrack, beautiful landscapes, and you control a ball-like alien hovercraft that can magnetize itself to surfaces to jump incredibly long distances, and a gliding feature that depletes your energy over time, as well a very, what I feel to be, a very intentionally vague story. This game helped me more times than I can physically count and has been my "comfort game" and coping mechanism for years. I know, it sounds crazy for me to be so emotionally attached to a game like this, but it blocks out all other unhappy thoughts the entire time I am playing it, and I just felt completely at ease, calm, and relaxed. I mean it when I say that Exo One might just be my escapism from reality. I got out of several cases of depression and anxiety because of this game, and the game just... means a ton to me. It has left such a wonderfully positive impact and influence on my entire life and it even helped me get through those tough last few months of 12th grade (senior year). I have already played this game like a dozen times over. I cannot recommend it enough. In the future, whenever anyone will ask me what my favorite game of all-time is, I say that it is Exo One. Now, they will just ask me why that game in particular is my favorite and I will just say it is because it is my favorite game.
Only I really know why.