Bought this a couple of months back on GOG and went to play it, however, a graphics issue makes it unplayable for me. Made sure all my drivers etc are up to date (Ryzen/Vega 56) and still the same, the sound was too loud though so whilst looking through it's settings I used the volume control on my keyboard to lower it and the graphics went normal! Three seconds later though they revert back, if I change volume then again back to good and a few seconds later back to crazy!
If I screenshot in-game the ss looks fine so I've taken a couple of photos.