Well...
You almost got it. The graphics were pretty nice and fit with the whole thing, you did good there. The style was good, and you put good use to split screen, however at first it looked like a good silent flash of the sorts but then suddenly there's voice acting. I think you should've put some voice acting in the begining to establish that there will be talking or not put any voice acting at all, it just seemed to break the flow when they spoke. The sound was nice, the music was pretty much perfect so good job but the voice acting was the best. Especially the laughing at the end which seemed off.
Overall, you took on an ambitious task and you almost got it. By the way, the initial plan the two students had was to blow up the cafetiria then shoot anyone trying to escape. But the bombs they put didn't explode so they decided to go in and just shoot people. I don't know whether you were aware of this or not. Anyways, it was a good movie but there were some problems.