Wii:
Smooth scaling 2d with discreet layers of bg and sprites. Each level starts with a one or more trees in different locations such as green plains, city park, african plains, jungle, desert. You control the wind with the movements of the wiimote. At key moments of a trees maturation you can cause strong wind the tree sheds seeds which you guide again with the wind to new areas around the tree and new trees grow. Once you create enough shade and food by growing trees animals and other greenery can join the party. Over time you grow a lush greenery and foliage outwards and upwards from your starting point as the screen scales in and out and moves around. Each environment offers unique obstacles to overcome; The park has human interference, african plains have harsh environment, jungle has competing ecosystems, desert is well, a desert. At certain points due to user performance and special broad strokes motions the player can create rain to help greenery grow or erect special foliage to protect the ecosystem from external factors which harm it. The game would be mostly casual with the emphasis growing your ecosystem with a personal touch and achieving equilibrium with the environment. To capitalise on this point users could take pictures of their ecosystem or trade environments with their friends.