After an hour or so of brainstorming, I've narrowed my options to two potential storylines to develop into a piece of interactive fiction. One involves a ghost trapped in a haunted house (world is confined to a couple of rooms), or a lonely watchstander at a remote space outpost who must make hard choices when proximity alarms go off indicating an alien threat approaching our precious little planet.

I cannot decide which one offers a greater gaming experience, so I will sleep on it and decide first thing in the morning.