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I thought it was nicely made especially the beginning and had a clever emphasis on sound. It wasn't the best written film ever but it did the job as a good, stupid horror film.
It was excruciatingly annoying in parts but I think that was the point.
It won't win any awards for acting or screenplay but it was fun and stands up against most modern, boring horrors.
It reminded me of 'Don't Breathe' which was a really good film too as it took modern horror conventions and played with them in a different way as the main characters had to struggle with the loss of an important sense.