An excellent parody that also satirizes...
...at the same time. Even though I never saw Twilight (or Buffy the Vampire Slayer for that matter), I understand where you're coming from. I saw an anime called Tengen Toppa Gurren Lagann and was boring & stupid as hell. As for the actual parody:
The animation, while not up to par with what you see on TV or in theaters, is enough to get the point across (the way it should be on NG). I also commend your lip synchronization skills, which were better that what you usually see here. Truth is, I'm getting sick of frame-by-frame/hand-drawn animation zealots who think they run the portal and would like to see them get lampooned. Plus, those gag posters were pretty damned witty although they could have used some more variation such as "Another Scary Movie Sequel/Knockoff" and "Popular Anime Movie That Is Boring As Hell Yet Gets Rave Reviews." The sound is another one of this parody's high points with excellent voice acting and enjoyable outro song. However, there's no sound effects, but you didn't need them for that would drown out the diologue. Speaking of which, it was really funny and made good use of the actual movie quotes.
What I liked:
-Witty
-Good art and animation
-Good voice acting
-Sums up my thoughts about Teeny-bopper flicks in a succinct and funny way.
What I didn't like:
-Posters could have used more variation.
-The easter eggs are superfluous, but those are just minor nitpicks.
Overall: Like Baron von Brunk, you are one of the pioneers of parody. Here's your ten for your sharp wit and smart writing.