Cool concept. I found out how to get the gun, but many dialogues just led to me being killed directly without a good way to interact.
Some demons aggro immediately so I learned to lure them behind the buildings and kill them there. It worked once or twice but sometimes they all noticed anyway.
Good game, but I think it should be made a bit easier for the player. Give some hints. Make the enemies notice you less and then it will be better balanced :)
Nice work!