That NPC really tripped as that ungodly creature emerged from the picture right before his eyes :)
You got an interesting idea and gave me a good impession of it. As others said, it would be nice to have more than one shot with some objects. Right now, the energy system and the inteactable object seem correlate exactly. For ideas: You could implement something to distract the NPC or lure him in on room (which takes energy) e.g. a radio, televion, etc.
Nice work!