Thanks guys.
Use of multiple devices is a good idea, will have to ensure though that the game / a game segment can be played on a single device in isolation so as not to reduce the market.
Funny I just went on rock paper shotgun and saw a 3D game in dev similar to the concept I was thinking about in 2D. Well there’s the game design work done. :)
http://www.rockpapershotgun.com/2010/01/28/theres-no-place-like-homeworld-floatilla/#more-24677