timppu: In that case I have to disagree with you. Since they are making no revenue on it, I don't feel they have any obligation to bring it to as many stores as possible, even if it would be nice to have it on GOG too. (Not that anyone has any "obligation" to bring any game to any store, for that matter...)
Yes, they are under no obligation to release it here.
Likewise, I am not under any obligation to buy any of their stuff here. And having that nagging feeling of missing out just makes me much, much, MUCH less likely to do so.
Not being able to get the whole package is just bad optics, man. Why, if I choose to buy my stuff here, should I have to go through another store to fill the gaps in my collection, just because the dev can't be bothered.
A similar issue is happening now with Thimbleweed Park (with Ron Gilbert going "Yo, free game on Steam and Epic! Fuuuuuck you, gog, lol!"), which annoys me to such a degree I'm regretting spending money on that game in the first place and quite fankly, I'm contemplating trying to get a refund for that game.