Desert. That's the theme for levels 31-40. It's gonna have ledges to fall off of and jump off of. (The jumping will be automatic)
And that means I'm coming along with this game. I've currently got 31+1/50+6 (The extra numbers at the end are the bonus levels) levels done. I'm not quite sure when this will be done at this point, but it shouldn't be long now! (Well, comparatively, of course. I shouldn't be another ten months working on it, basically.)