Something I'd suggest would be trying another rendering mode.
While in game, go into options tab, video settings, and then set it to the rendering mode not selected. Then restart the game. If that doesn't help I'd suggest a completely clean install of the game.
Remove the game folder
C:\FeralHeart
Then download a new installer from our downloads page and install the game with that one. If you still have issues there might be a problem with your graphics card and that it doesn't want to render the game properly. And in that case I'd suggest first running windows update, and then possibly install new video card drivers.