How can the game be loaded on a different monitor?
Solution 1:
It seems that the latest update (at least on Steam) added the ability to select a monitor for the game to the laucher. I have no doubt this update will also get on GOG, if it already hasn't.
Steam patch notes found here: http://steamcommunity.com/games/322500/announcements/detail/970894511942261537
(Tried looking for GOG patch notes, but didn't find any.)
Solution 2:
Start in windowed mode, drag to correct monitor. Hit alt+Enter for fullscreen, quit and restart with windowed mode uncheck and thats it fixed