That's very interesting. Perhaps you should post the low FPS version in the OP, and keep the high FPS hidden behind a [ spoiler ] tag. That'll remove bias, I think.
Staring at the low FPS version now, I immediately thought it looked fake, but I can't be sure if I'm biased because I know it's fake. ('fake' as in 'not manually drawn', of course)
In regards the the anti-aliasing, people are able to do that just as well as machines. If you limit the number of colours, the main difference between automatic AA and the AA done by a good artist is that the latter is better and follows certain principles, avoiding stuff like jaggies and banding. The number of colours in itself isn't really the issue either, because there is PA done with 200+ colours, and it still looks like PA, unless it's a hyper-realistic tracing of a photography, for example. So I don't think you need to reduce the number of colours to 8 or remove AA for this to look like pixel art.
I'm glad you posted this here rather than the Low spec forum, otherwise I would never have seen it. It's an interesting discussion, and I would argue it belongs here as much as in any other forum, since the issue is whether or not it looks like pixel art.