Hello.
I suppose any piece of work based on the Columbine shootings would be very similar to each other, but your work seemed much too reminiscent of Gus Van Sant's "Elephant." For example, the beginning where the two killers tell their friend to "Fuck off," and even the sequence of areas, such as going to the cafeteria and then the library, seemed directly from "Elephant." You state in your description that the dialogue and sequence of events were factual, which I won't argue against, but again, my issue with your presentation of the events just seem too similar to a previous work. Perhaps you have not seen the movie, or you might have even devised this flash before Gus Van Sant even speculated about basing a movie off of Columbine, but even so, it has been several years since the incident and other attempts at representing the tragedy in a media aspect have been numerous and better done.
Good flash though.