Are you on a Windows computer? If so, can you see the game icon on display? Can you select it and use Alt+Enter or Windows-key+arrow-keys to influence the screensize or fullscreen state of the game? Does this do anything? Can it be that the game is running on a secondary monitor that is temporarily disabled?
In your game-folder you should see a settings.ini file. Could you try deleting that while the game is off, and then start the game again?
Let me know if any of this helps. Otherwise we'll continue the search!
Thanks for the update. I hope this is a step in the right direction.
Next step is to figure out if there's any data in the Log file.
Could you navigate to Program Files (x86)\Steam\steamapps\common\Godhood and send me the abbeycore.txt file? You can e-mail it to firstname.lastname@example.org. You can also upload it here as well, but it may contain some sensitive information like your PC name, Steam account name and other PC specs.