Game ideas: Sparrow

A flight/racing game where players take control of a sparrow.
Having flown in and gotten confused the little birdie must find a way out of the parking garage and back to the surface. Being careful not to collide with anything (especially windows), players must navigate their way through a maze of concrete and metal from a bird's perspective.
Done as either a FPS or with the camera positioned just behind the bird. Sparrow racing multiplayer event.