Luanti (Formerly Minetest)

A time-traveling puzzle game; find unexpected routes around obstacles as you traverse a ruinous landscape. Use both growth and decay to your advantage. Strategically position foliage in the past. Winner of the 2023 game jam.

As it's from a game jam, there's a little roughness in some of the puzzle design (I had to look up the final parts), but overall it's an interesting and impressive game. If you're looking for a relaxing mental exercise, it very much nails that feeling.