Idea and action would certainly have lent more

The script has more holes than a Swiss cheese. The idea is really great but up and just at the end to come so many things before that simply did not conclusively that are the movie do not really can pull into the action with inside. In some places probably lacked the money for useful special effects, but most were simply "unmotivated" cut away from the scene. Of course you can also use something consciously, unfortunately it has here really rather then looked that had been the special effects easy to cut. The psychological component like the teacher, the parents and all else would have been manipulated better can represent. A bit more Holywood technique a little more sunny and cheerful scenes to break the tension and rebuild and the story it would have been easy to 5 stars for me. The spectacles are in my opinion, even quite well occupied.