Not a bad interperatation.
You seem like you really did your research but I think you tried a little too hard in some areas. The overall story and the way you portrayed it was well-developed and it had a very intense impact. The art was decent and the animation was smooth. The voices were pretty insincere but your use of music was good. Not that it matters (considering this is your own interperatation) but the two boys responsible, though rumored, actually thought Marilyn Manson was lame (I read it in the book "Parental Advisory" which is about music cencorship in America). The movie well done overall though I really don't think the people affected by the tragedy would truly approve of this production.