It will be a Third person perspective game. Why perspective? Because you won't shoot a lot in this game. You will be able to shoot at monsters but only to protect yourself in bad situations. You will have limited bullets.
You wil explore large amount of land in order to find the victims dead or alive. Ghost will throw stuff in you, you will be hearing stuff, voices screams and locking for help in order to atract you in dangerous places and locking doors behind you. You will also have calm bar which will show your heart rate and bluring your view if your heart rate is way up. There will be a button to calm yourself. But ghost will know that you are nervous and try not to calm you down. If heart rate reches certain limit and your screen is almost blured your character will run away from the place. It will be game over for that day, you may try again next day. But victims can't wait so abusing day limit you will find your victims dead. view full article
In this particular case, demon will not overpower only one human. You will find yourself surrounded by people overpowerd by them. You will have to knock them out and exorcise them. To be more precise, you see a possessed guy,(they can fight too), the best strategy is to knock them out with a baseball bat or example and exorcise them. I will think better about this.
Stealth action. You have rifle with limited amount of bullets and flashlight. You are alone, probably in woods searching for victims of monster attack, you will hear strange noises, some times even see the monster or his shadow passing by. Choose between trying to kill him or rescuing victims first, don't forget that they are unpredictable.Your primary objective is to save them. Secondary kill the monster.