On Steam the game is available for Win, Mac and Linux: https://store.steampowered.com/app/1224020/Creepy_Tale
What is going on here on gog.com?
I really don't know. I just stopped asking that question a while back because it does nothing but hurt my head.
There are a TON of games on Steam that publishers think GOG users shouldn't get complete. And by that I mean getting the Linux and Mac versions.
I have no idea if there is even something that can be called a rationale
behind such decisions. There must be reasons, just not rational ones.
Piracy? That would be laughable since all games on Steam are pirated non-stop. App Store exclusivity? Then they should not be able to sell them on Steam either. Different companies doing the transcodes to Mac and Linux so rights are spread out? Some, yes, but most definitely not all. A technical nightmare to keep up with the ever more eccentric MacOS? Sure, but then why the games are not recalled from Steam too?
I am guessing that the reason is, as always, not a singular one but a mix of all.
In any case it is as Little Misfortune
says: Yikes forever!