Excellent
Very high quality work. I can't fault the gameplay, really. It was a pleasure to play, and, unlike most flash games, it has enormous replay value.
Being the graphics whore that I am, though, my only complaint is that it could've been prettier. Flash has some awesome effects, you can recreate bloom or hdr with some of the filters, motion blurs are possible, soft shadows, dynamic lighting (all simulated of course). I understand that you were probably making it as bare-bones as possible to make the framerate acceptable with an enormous amount of objects on the screen, but an optional ultra-high-detail mode would've been appreciated by those of us who would prefer to play FEAR at 3 frames per second with graphics on full, rather than have it playable and looking like D00M.
Either way, though.
Excellent.
I'd love to know how you managed to write such an efficient engine (: