the idea is that you drag the boxes over the zombie hands that comes out from the dirt. Once you do this for 3 or 4 times, you get the flash light that helps you kill the ghosts. I think all of this should be clear if you play the tutorial in the beginning.
The thing with the survival is true, a few people told me the same. Right now you end up a level once you�ve cleared the area of a certain amount of zombies, but there is no feedback to the player and I think it doesn�t feel right. Anyway thanks for playing and for the critique.