Awsome Game....but....
hey man, awsome game! it was a lot of fun to play. I've just got a few suggestions tho.
1: Make the 'guys' arm not stick straight down the whole game.
2: When walking backwards the guy should actually turn around and walk that way.
3: "Explosive Scenery" Make the surrounding environment interactive, for example, the innocent people that were killed, if you shoot them for instance, the guy on the ladder, maybe he could fall off of it or something. Or the hobo in the garbage can, if you've already played the game and know he's in there, you could shoot the body of the can and have blood pour out of it or something.
Overall GREAT GAME!