@DavidNielsen @eniko (I am not affilated with the developer(s) of this game)

Assuming the reason you want it on GOG is because you're anti-DRM, I'd suggest getting the itch.io version of it. While games on Itchio can technically have DRM (I think), I've not really seen any have it other than ones with Patreon rewards/unlocks. I can't speak for the devs here, but I assume the game will be DRM-free on itchio.

If it's because you like the GOG Galaxy client, you can always add the game to it. There should also be an integration for Itchio that auto-adds any claimed games on there :)