Extreme realism is the name of this game. For instance, when using the shotgun, you fire from the hip, and your characters body recoils accordingly. Arms jerk back absorbing the shock, and when firing straight forward, the characters lead foot tips back lifting his toes up slightly. If you fire up, all of the characters joints give slightly from absorbing the shock. You even have spent shell casings eject from your weapon which fly out and bounce off the ground.
Enemies are equally detailed.
When fighting a zombie, you can shoot its knees out with the shotgun. It lifts its head and begins pulling itself towards you by it's arms. Miss once too many, and the zombie will devour your flesh. Camera angles in the style of classic horror add to the suspense. You will have to experience Resident Evil to find out.