Disappointed to hear about this game and look it up to find "moved to steam" instead of expanding the availability. There are a variety of reasons for people to avoid Steam in recent years (not the least of which being the fact that Valve has been knowingly harming their customers for over 5 years now...)
I hope you bring the game back to a storefront that's not a pile of trash. There's a lot of advantages to using Steam, but there's good reasons for some of us to avoid it (like, for example, the storefront not actually providing any safe way to access the games you buy there... kind of a big one).