If you’re interested in 4X games at all Sid Meier’s Alpha Centauri is only $1.49. It absolutely holds up and to this day probably still has the best story of any 4X game.
It also works great on Steamdeck with a couple of easy tweaks. Unfortunately the instructions for those tweaks are currently in Reddit blackout shutdown limbo so I can’t copy them here, but when the blackout ends you can Find The Instructions Here.
GOG Summer Sale 2023 is live with giveaways and game deals (www.gamingonlinux.com)