Years ago in my sister's old Nokia phone I used to play this one 2D game where you dug earth, as far as I know that was the only thing you could do as there were no enemies, maybe obstacles (twas most like a puzzle game); something similar to Diamond Rush but far, far simpler. If you dug too much in a specific direction you'd end up in an endless black void. There was a health bar and a score bar, that's all I remember from it.
sounds interesting, not sure I remember this one. I loooove Diamond Rush though. You can torrent it online btw I play it on my touch screen phone all the time:)