Hmm...
I'm trying to review this on it's own merits, apart from the events it is associated with.
The animation was smooth, the violence was brutal, and as a pure shoot 'em up movie this is up there with the best.
The fact that it just ends abruptly and contains no dialogue, no explanation, no webpage advertising, no credits, and no extraneous ANYTHING really sharpens its punch.
This movie is, to me, fairly revolutionary in terms of delivery/presentation. It comes out of nowhere, shocks you with violent images, and then disappears. It will leave a haunting impression for years to come.
It's really too bad this individual was so disturbed. He could have showed promise as an animator.