Hmm, what am I missing here. I load up the game, and I'm in a cathedral, but there are no enemies, I can't exit the room, and can't seem to do anything. Also, wish I could change the mouse sensitivity because it's really really high for me.
You need to go to the opposite side of the room, face the door and press F. The crosshair turns red when you are in interaction range. Mouse sensitivity isn't implemented yet, I'm sorry :(