for something original, you could make the zombies like shadow people or something, and make them move fast. That would go with the hallucination thing that you have going, or you could make the zombies slightly transparent so the look like they are figures of an imagination. I do think your whole idea of hallucinations is very original though. When I said that your story sounded a lot like left 4 dead I meant the whole zombie infestation idea of it, but I guess if you find a way to make them unique then it would set it apart front left 4 dead. Another cool idea is that he is hallucination the zombies, but in real life they are actually real people (kind of like silent hill origins in a way), the guy is killing innocent people he interprets as zombies (if you get the idea...)
As for rewriting the story, keep it as it is, I think its a good story nonetheless.
Also I would pay attention to what rolfy said.
I think the game should be in color though, but bloom it up and keep the filmgrain, it would look more dreamlike.
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