Hickory: Logic Artists are Steam-centric. They even use the Steam forums as their semi-official point of public contact and bug reporting platform -- you'll see official announcements and such over at Steam but never here. It's no surprise that GOG is out of the loop.
Sapare: Which makes having bought the game on GOG make me feel like a lower value costumer. I actually really adore this companies games, but you can't argue both costumers are being equaly represented if on the steam forum every topic gets a mod/dev reply and on GOG forum there hasnt been a mod/dev post in ages.(since june?)
It is incredibly awkward that if I wanted to post about a bug, I need to go to the steam forum(without owning the game on steam), then report it there, and get told "Are you runing 1.0.6? It is supposed to be fixed in 1.0.6". Making any input I can give to the dev team useless, because I can't run the version of the game they want me to run.
I actually want to post my general thoughts on the game, because I have a good few of them, but whats the point of the version of the game I am runing isnt considered up to date.
Unless I am mistaking, their offical webside doesnt even ever mention GOG or that their game is on GOG, they have links to the steam forum and store page, but nothing for GOG. I really think at that point they should consider just sticking to Steam for future games, maybe put it out on GOG once you have reached the final version of the game and are offically done patching and developing it, then put it on GOG for those that really hate steam.
Mind you, I do understand that the dev team is tiny and(I am guessing, I have no insider knowledge) this game can't have been much of a comcerical sucess, so I do sympathise with the need to cost cut and inability to keep multiple forums up to date, but that does not stop the consumer from feeling shafted.
I suspect it sold better than Conquistadors (due to marginally better marketing, plus it's a more "traditional" RPG which people apparently want for some reason) - but I can't confirm as I don't have sales data.
Team size notwithstanding, there's little reason to not support both GOG and Steam properly, and despite the Steam vs GOG issues I'm glad they decided to release on GOG near-simultaneously.
The fact that many devs seem to obviously favour Steam is, I suspect, mostly due to it being there first - but could also be due to Steam's APIs just being easier to use in comparison to GOGs. If the latter is true, GOG need to up their development game - they already started way behind Steam, they need to catch up fast (but also without doing stupid things like adding Galaxy by default to game installers etc.).
If at least they had a third-party forum it would be a bit better. They used to have their own forums (on their website), but these seem to have disappeared. Using a particular platform's site for your forum (at the exclusion of others) is definitely something they should rectify, then we'd feel a tiny bit less shafted...