Outerwilds is a beautiful game and quite short, try to go in as blind as possible. It's space archaeology.

Gris is an art game that's about 3hrs long. Very pretty, very zen.

Into the breach, is a puzzle game (chess vibes) where you are time travellers saving the world from insect aliens. has a long time to beat, but play sessions are fairly short. I think it's a great game for when you are taking short breaks between something else. it might be a tad too on the roguelike side for you, but it's primarily about solving puzzles.

Carrion is a puzzle-horror game that took me about 5hrs to beat, it's extremely satisfying

Nauticrawl is a very esoteric game, you pilot a sub at the bottom of the ocean and have to learn from scratch how to pilot it. If you like doing stuff with no instructions you'll enjoy it.

Not for broadcast is a shortish (~20hrs) game where you control a live action broadcast and get points for how well you do cuts... or censor people

Superliminal is a 3hr puzzle game that plays with size and perspective.