Just a heads up, if you purchase on itch.io rather than Steam, the devs receive a larger share of the revenue. (Though obviously it's not integrated into Steam, if you prefer that.)
Considering I've given them a few bucks a month for a decade and a bit now which doesn't even come close to the value I've gotten that is a great idea.
https://kitfoxgames.itch.io/dwarf-fortress