whenever I have to update the game with some kind of bugfix/etc. - the gog.com version will get the same build as soon as I release it
currently there is a map editor in the works for version 1.1; since Steam has Workshop, and I am the only person working on the game, I am focusing my efforts there, since the people testing the game often report various issues, which I fix and then upload the patches to Steam
unfortunately, as I have mentioned, I work alone, and as such don't have enough time to put builds up everywhere, and keeping the builds up-to-date in multiple places would take away even more of my time
once the map editor update is ready, you can expect it to be released on gog.com at the same time as it will on Steam