Eh, kinda cool.
But the guy who played the game in your movie must have been 5 years old. You have to really, really, suck to play the game like that. I couldn't really relate to it, because even though the Library level was long and difficult, you exagerrated the experience to the point where I couldn't suspend my disbelief.
I'd be more enjoyable if you had 8 enemies on the screen at once, pouncing at you from all sides, you moving almost constantly backwards while shooting as fast as you can, stressing out because you can't possibly have enough ammo to last the next couple minutes, etc.
I also rather like that level, personally. It gives you a sense of dread that no game has been able to give me before.