They didn't remove music nor parts of the game as others said, but this GOG version is completly broken, unstable, crashes everytime you autosave and without features (such as patches, "MondayVision" mode, soundtrack, artbook and achievements) like Steam's. Please, GOG and Aspyr, fix the problems of this masterpiece like you did on Gaben's plataform, it seems that they just launched here and gave zero F's to it! Respect your costumers!