Not a lawyer, but it should clearly count as transformative and fair use, especially if you're not distributing the assets. Copying from games could be considered fan art, probably should label it that way. But asking for permission from individual artists is always a cool thing to do, and you'll get permission most of the…
Thanks guys! The first post was updated with the final submitted video. I've been getting lots of questions about the snakes, so I'm writing a quick explanation here: I made the blockout animation using splines and a basic mesh with a path deform modifier. After I was happy with the timing and all, I've modeled and…