Great game; enjoying it so far. I wouldn't stress the minority reaction in GoG - the community over there is generally much better than that, but does get a bit trollish when it comes to anything they perceive as DRM-related. If the individual was too knee-jerk stupid to figure out that that's not what you've built, then their opinion isn't going to carry a lot of weight.
I note that you have a Linux version of the game available; is it possible we will get access to that through GOG?
For anyone else trying to play from Linux, I've got it running under wine, but strangely the only way I can get it to start without crashing is to re-run the GOG installer and hit launch at the end; running the exe directly causes a crash. That's not a complaint - running the Windows version under wine is obviously an unsupported configuration - but possibly it will help other Linux-wine folks get the most out of their Windows copy.