sanscript: An update from the developer:
Selaco's Early Access launch is not likely to arrive on GOG unfortunately. v1.0 seems more likely. I made the unfortunate mistake of hinting at a GOG version before realizing the complications. For that I apologize.
Releasing on multiple launchers requires a lot more work and maintenance than I realized, and given our plans for active Post-Launch support during our Early Access period, it would end up slowing down development by a lot.
Thanks for the update, sanscript. It's the same "Update Fatigue" story as many other Indie games where the devs start out wanting to support smaller stores, but when a games needs 30 updates x 3-5 stores (because each store wants its own special achievements, has its own update 'backend', etc) and the novelty of re-uploading it hundreds of times wears off, they then want to support only the larger 1-2 stores.
sanscript: There are other challenges involved that aren't related to time costs, too. We worked hard on adding integrated modding support using the Steam Workshop. How is that going to work on GOG? It would mean some mods are locked out for GOG users (unless modders upload their mods on other places which I highly encourage).
^ Just another example here of how the Steam Workshop has been incredibly toxic and hostile to the formerly open and inclusive modding community. Time will tell if the game actually "needs" mods or if most people are going to play it as it is (just like Hedon, Hands of Necromancy, etc). If it's the latter then as long as we do get a "finished" DRM-Free version though, personally I'm happy with a v1.0 mod-less release.