I was thinking of the Apple II+ games of yore. There was an
aircraft simulator in which the planes were different ascii
characters and you brought them in.
I have this very halfbaked idea of a text game in which font
sizes are used to give a third dimension to the visuals as
seem to recede away from the screen or
come back at you.
Maybe this could be educational? Throw a letter at an
advancing word which is missing some, completing it before
it slams into the screen? Or change a word into another less
dangerous word, Letterman style?