Actually there is AI, it was on previous versions, but zero took it out for improvements. There's also audio, although only ship related (engine sounds, collisions, etc).
It's not even half way done if you want my opinion. Even though the programming seems advanced already I think there's still a lot to do i.e. weapons and such...

The only reason you can't find almost no reference on Slipstream GX, beyond what we put online, on the interwebs is because it's still an underground game, once we release a demo version I will make sure we get noticed.

And Amaroq, not all ideas must be visual, keep that in mind. I can assure you that some ideas you gave on the physics are being used... Just because you don't see it, doesn't mean it isn't there, well, in most cases that is.