I think the game's mechanics and controls might be a tad too complex for the control of a multi-touch screen. There was a game that was released on iOS that was somewhat similar to SS2, but simplified heavily and yet it still had too much going on on the screen.
I think the 3DS would be much better suited to the mechanics of SS2. I think that would also make the 3DS my favourite handheld of all time if it could run a portable version of it.
EDIT: Wow, I didn't even realize how old this thread was. 3DS wasn't even a thing yet when this was posted. Oh well, my point stands.