Upgrade to the GOLD edition with this DLC. It includes the following exclusive features:

-Fullscreen support (from menu)

-Soundrack (from menu + mp3 format within game directory)

-Art book (in pdf format within game directory)

-GOLD EDITION badge in inventory screen. 

Gold edition badges are visible in the menus of the game so that you can show others your level of support on your livestreams and youtube video playthroughs.