Holy crap, where to start...
First, I can't believe you did all this for a high school final. Talk about going above and beyond.
Next, your Japanese was dead-on. I'm not a native speaker, but everything sounded correct. Translations were done excellently too, but they should be, since you made it :) I'm impressed at how well you speak Japanese for being in high school. There are people in my 3rd semester course here at college who would have been lost.
I really enjoyed the couple little things that you had to know some Japanese for -- Shiken as the one boss plus the double meaning between the name and kanji, the Mahou eraser ... :)
Also, the sounds and music are done excellently, as are the voices. The animations are a lot better than so many of the entries here, too.
My -only- gripe would be to add a restart button at the end, rather than having it automatically restart, and maybe have a preloading screen leading up to the start/continue screen, where you have some "I'd rather start my save game" message if you click on the start button rather than the continue button. But these don't take away from the enjoyment of the movie at all.
The bottom line is that this is an absolutely awesome movie. Great work!