I have been trying to get my mind around this for a while, but it is tough.
It may sound like a wussy thing, but let me be clear, I can´t get my head around doing top down gfx to this as it looks considering it is 3d and things are falling south, where it should be down.
That case goes fine in low res 2d, you trick things that way me guesses.
Yesterday an idea came to mind, that it could be ´aquaplay´styled. You know, those water screen handhelds... a picture appended if you are floating.
So a vertical approach would be cool, but what exactly is the player is still a tough thing to figure out, one that goes about any direction without the will of gravity while anything 3d responds directly to newton stuff?
I´m thinking gfx here more into real stuff then abstract, let me think a little more into it.