The Talos Principle (both of them, though the DLC for 1 is optional, and incredibly challenging). They’re the best puzzle game I can recommend next to Portal. They do their own thing, and almost to the same level. The gameplay doesn’t feel quite as smooth, but there’s a lot it goes better than Portal too.

The Outer Wilds. It doesn’t feel as chill to some people, but I think it is. Very tiny first ~20m spoiler that can help ::: spoiler spoiler it’s a time loop, so there are no consequences. Feel free to wreck your ship. It’ll be repaired next loop. Feel free to mess around and die. You’ll lose nothing. Don’t be sucked into the idea you need to do things well or quickly, because it literally does not matter. The only thing that effects the next loop is what you learned. :::