Screaming at a wall of text

It will likely never get made cause well, duh, I have no ability to make it so but I am really digging on this idea for a relatively short game (think maybe Portal length)…

First person shooter/action type game.

Starts abruptly with you just waking up in a park or old building or whatever. Things look all post apocalyptic; broke down buildings, trashed everything, dead bodies. No explanation or exposition is given. After walking around a little bit you start having to fight zombies/mutants. Goes on for a while, pretty standard fare.

As the game progresses you start seeing little flashes of people screaming and dying and running away and so forth, displayed in such a way as to make you assume it’s memories of what happened slowly coming back to you. Eventually though, it starts to have more direct relevance to whatever it is you are specifically doing at the time and they begin to get longer. Finally, it slowly (or abruptly?) becomes clear that these “memory flashes” are actually reality  and you’re just out of your fucking mind going around murdering regular people because you think they are mutant zombies.

I dunno about the best way to wrap it up though. Maybe you end up getting caught and the last scene is you in a regular mental asylum with a voice over of a reporter talking about your case to make it really clear for anyone who might have missed the slightly subtle cue that you are a crazy dude and it’s not the zombie apocalypse. Maybe you end up having been brainwashed and used by terrorists or something? Maybe it stays open to interpretation and kind of ambiguous or at the least not 100% clear that that is the case?

I do like the idea of it being a really clear situation, then more ambiguous and finally clear again, only very different than the first senario. There can also be all kinds of fun really subtle clues from early on that only really show up in retrospect (all sixth sense style).

Also, I’m a terrible pitch writer. I’d like to get better, anyone know any good sources for such info?