I thought I was doing something wrong since nothing happened when I got to the escape vehicle but I see in other comments that the game is unfinished, which is too bad because the potential is there. I did have fun gathering a great horde of zombies behind me and try and get them stuck behind the bushes :P
Oh, and Paused does only mean paused for the player... The zombies still move when you are checking objectives, that was a quick death because I noticed it too late and was totally surrounded by them :D
Great job !