1) more realistic graphics, graphics relaistic enough to make you crap your self.
2) the player could jump to avoid the little thing monsters
3) had multiplayer (a must for all games, it’s more fun to play against human players then CPU players) with the option of survival mode where one player starts out as the thing and must hunt and infect the other players to win the game.
4) first person view. third person is way to damn easy, first person is where all the suspense is since you have to always watch your back which of course makes it harder but st the same time more scary.