I highly recommend factory games! Factorio, Satisfactory, Dyson Sphere Program, Shapez 2, Captain of Industry, to name my favorites. I also hear Mindustry is great and is free. All of these games run perfectly on linux (some via proton) and work offline just fine.

Oxygen not included is nice but mentally taxing sometimes.

Factory games can be mentally taxing in a similar way that programming can be, but less abstract and more hands-on. If you disable enemies (it's always an option in these games), there's no pressure or stress of messing up like there is in Oxygen Not Included.

You can easily put hundreds or thousands of hours, and years of your life, into a single save. There's always goals to shoot for, production to expand, new paradigms for structuring parts of your factory, and ways to rework or improve what you've already built.

I look at it as if my world and factory is a zen garden that I visit and spend some time tending to it, since there's always something to work on. it helps me avoid getting overwhelmed. there's no rush, there's no standards to live up to, it's purely your own little world that you can design however you like and work on at your pace. There's always a million little dynamic puzzles to solve, and a million different ways to solve them. Or if you're not feeling up to solving puzzles, you can fix up an older factory design, or add to the aesthetics of an area of your base.