I might do a second entry --- or rather, just make an RPG based on this theme. A survival horror/action thing (?). Basic idea: survivors of the alien invasion of a terraforming colony are now treated in an insane asylum back on Earth. Each character has a mental balance/sanity/equilibrium statistic. The gameplay is divided into two phases - daytime and nighttime. During daytime, inmates go through their healing process, chat to each other, solve problems, etc, they have a chance to either decrease or increase their mental state. The nightphase brings the horror. The traumas experienced were so great, that the characters' fears are projected into reality: a collective nightmare incarnate... So now they have fight the Aliens at the mental hospital. The more "insane" characters are (the lower the mental balance) the more aliens appear.
Daytime can be used to
1. increase mental state,
2. set up defenses against the monsters etc
The conflict is made worse, of course, by the obnoxious moronic staff of the hospital.
I need some time to think this over, I like this concept and feel that turning it into a 24h project might cause me to rush it.