I guess it depends on what difficulty setting you are using, but on "normal" it was trivial to stand exactly where you enter the room and shoot them with the shotgun when they rush you. It takes time for all of them to come to you, but it is not necessary to move into the "maze portion" of the room at all.
Haha should have specified Survivor mode. Ain't got no ammo!
Easy-Hard is really easy to me at this point, having played it a ton.