Satire on Modern Horror Movies
It is that, besides being another stab at that pop singer. The premise is weak but that's what adds to the charm: it's a horror movie. They're generally of a weak premise.
Most of the time, any animator who overextends the Body-English of a video game player on the couch, Wiimote or otherwise, loses points in my book. Only during momentous occasions in the game would anybody do that. We don't pull a guy's attention away if he's bouncing around like that, even in this setting. It's just stupid, since he wouldn't pause the game just to look at a stupid YouTube movie. I have seen the same mistake about Body-English and video games in movies, television, and especially commercials for years now, and I'm pretty sure it's due to a lack of observation on part of the artists. The Body-English can happen, but it is far more subdued and most of the time it is merely subtle. Few guys jerk around quite like H.M.V.* #1 did.
Anyway, another issue lies in the fact that this might actually scare the little children. Really. Some cartoons can do that. This is one of them. There isn't a wham-bam-thank-you-ma'am spook moment, but the general ambience and creepy chanting might send a mixed message. It isn't supposed to be scary, but it could be. I recommend raising the rating to T, just in case.
If TeamBeatman or some other crew ever did create a full-length series of cartoons based upon this premise, we really wouldn't be able to call it "Rebecca Black - The Movie", or even "It is Friday". They're misleading, first of all. Second of all, they aren't that scary; some kids might even think she's okay and just getting lots of undeserved negative feedback. While it spoofs her music video through and through, the movie doesn't really have to include her in the title. There needs to be some ambiguity. May I recommend "Thirteenth Friday", or "Friday, Thirteenth Friday".
For a movie of this length and size of file, this packs in a good deal of entertainment. The issues that are brought up are minor in reality. Just keep up the good work, TeamBeatman! Oh, and change that guy's ringtone. That song sucks so bad.
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*: Horror Movie Victim