Texts take the same pointer events as sprites: onPointerOver, onPointerOut, onClick and the rest, in createText's options or connected later with listen() (that is how EXIT gets its). The whole block reacts, gaps between letters and spaces included, so an option does not flicker as the mouse crosses it.
SOUND rewrites its own .text and the area that reacts follows the new width. START changes scene, and BACK comes back.