http://www.voletic.com/reviews/hellphobia-review-pc/
Take yourself back to 1993 and you might remember a certain little indie game called ‘DOOM’. Fast-forward twenty four years and you might come across another game by the name of ‘DOOM’, however you also might find yourself a new little hellish nightmare adventure that goes by the name of ‘Hellphobia’.
Fix Overlay Steam application.
Fix Overlay: add Command --in-process-GPU options Steam Launch, press the Right Mouse Click on the Start Game choose Properties, and Options paste the code to enable the Steam overlay.
New level difficulty
in Hellphobia you can choose two difficulties "normal" or "ultra-violence", make your choice and face the ultimate evil. It contains new game plus.