If they had told the story in cronological order would have been magnificent. The fact that from the first 5minutes I have seen right to the end of the film. I already know all the characters will die. So how can I become invested? There were certain scenes that had I not already been told that character dies would have had tremendous impact. The film takes away hope of anything by constantly showing forward clips and revealing who dies so early.
But having said that is gripping and acting is v good even from the kids