Needs more substance
Not exactly the kind of christmas present that I would want... I like the atmosphere you've created - the bitter contrast between "merry christmas" and the subject material. It does make for a dramatic effect.
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But it doesn't make any sense. Without some sort of explanation of what's going on, it really is somewhat self defeating. It's like walking into the emotional climax of the movie and not knowing what the hell is going on. This movie should be prefaced by at least 30 seconds of material leading up to this point. Then this could be a truly chilling movie.