First off I'd just like to say that I absolutely LOVE this feature; it adds a whole different dimension to the game. Watching huge battles on a slight angle somehow makes everything in the world better.
Anyway, I think it could use a couple improvements. Currently, the camera does this thing where it knows that it's upside down or on a diagonal and all the zoom/camera movement functions become sort of messed up. Trying to zoom at all is really awkward and isn't as fluid or smooth compared to the default top-down view. Everything feels sort of 'flipped'. I always feel like the camera is trying its hardest to get me to use the default top-down view. I propose that you get rid of this annoyance entirely and allow the twist mode to be completely 3D free roam.
The whole mode is really weird at first and it took me a while to get used to, but I have no problem with finding my sense of direction and locations of all the planets. I don't know if this camera thing is intentional, but if it is, I think it's highly unnecessary.
Thanks for reading. Awesome game by the way