If you like factory designing games, I can recommend anything by Zachtronics.

They’re all esoteric programming/automation type puzzle games, and they all have their own unique solitaire games built-in for whenever you get tired of the main game.

My personal favourites are SpaceChem - scifi molecule factories - and Opus Magnum - steampunk alchemical molecule factories. Something about the molecules just works for me, don’t know why. Plus the Opus Magnum solitaire game is really unique and fun, and it has a user-made level feature, so you can keep playing.

Last Call BBS is a collection of minigames they made as their final release before shutting up shop, so it’s a lot more casual than the others, but a lot of fun.