for being only 12 you did a great job on animating this. I am 21 and can't animate a tbing. (+ 3 on being able to do this well at your age.)
Good choice of song (+ 1) pretty decent storyline ( +1 )
now for the problems I saw with this
continuous looping (- 1) No loading screen or play/pause/stop button (- 1 )
the video was too short, did not have enough action (- 2 )
(the base value I used when calculating my score was 5, every point equaled half a star.)