It's that ending....
I was sitting there thinking, "Yes, this is a bit slow, but that's okay. The graphics and everything are absolutely beautiful. So I'm enjoying myself." And then I see the ending. It seems to me you just didn't know how to end it. I can understand wanting to add surprises and twists in such films, but you must admit that the ending was very sudden and very thrown in. I would've been much happier if he'd simply blown the world up and that is how the film ended. Oh well.
I am confused about someething plotwise, though. Why would a scientist of Earth build a machine to destroy Earth? Is he chronically depressed, or misanthropic? I'm not sure. It doesn't make much sense to me. At first I thought maybe it was someone who was not of Earth, but the fact that the machine had killed the scientist and risen into the air and had begun to load his gun to destroy the world before him, comfirmed to me that it was indeed Earth. Simply wishing to clear up this confusion to me.
Oherwise, very good job. I liked it a lot.