For those wondering how he is surviving: from the looks of it he has a tube of some sort coming from a container on his back to what looks like his chin. Due to it going to what seems to be his chin I would assume that it is a mask and he is wearing a radiation suit of some sort. As for the tank, it probably has oxygen in it.
I think that the mirror on the first floor is the best option to scare people out. Once it has level two scare then you can spam it and anyone in the room will run away mainly to the door to leave.
 "Nuclear Plant"){kind=icon}
 "Gravitee Wars"){kind=icon}
 "Haunt the House"){kind=icon}
 "GunBot"){kind=icon}
 "Mamono Sweeper"){kind=icon}