Wolfram_von_Thal: Hi,
no, I'm not seeing ghosts. ;)
I've been in contact with the developers of the game and got the information that they've sent the patch to GOG two times - one time in february, the second time some weeks ago. The Steam- and Humble-versions seem to be up to date since february, the GOG-version isn't .
If you look five threads below this one, you'll find another thread with the same problem, describing one of the bugs.

Wolfram_von_Thal: Better late than never I guess. ;)
Thanks!

edit: Alas! I can't install the patch. By clicking on the 1,8 mb-file, nothing at all happens, no message, no loading, nothing...
Is the main gameinstaller updated too?