to keep it short:
make it comfortable to play in vr.
controls shouldn't be too far from the camera, and the cockpit should be relative to the aircraft's size.
Idk if they're still handing out the curated status, but, that's the gist of it.

It needs a vr cockpit, and it cannot be too big, etc. there are lots of things.
Andrew made a post about it a while back.