Not much of a computer gamer but my son got me playing this two nights ago. What I liked about it (except - it's a little bit creepy!) is that conserving energy is one of the objectives of the game. When you get down to zero power (from closing the doors or turning on lights to check which spooky fellow's outside) you lose. It was very Dr Who-esque a la the Angels who move in an instant when you blink. Don't know whether it was cooked up by greenies or not. Of course this greenie managed to run out of electricity by opening and closing the doors and checking the CCT cameras too often. You drain the power grid, lights go off - boom you get devoured by a spooky toy character.
Fun stuff. Well, I wonder how many other computer games incorporate more subtle conservation themes. It might be more ideal if an environmentally friendly act isn't the main objective as depending on the demographic, it can be a tad 'uncool' to be green focussed, as a youngster.