I'm still trying to get round to playing this. I poked around a bit but I just wanted to say this is cool as heck.
I've actually been thinking about making a Teletext game for a while and never got around to it. I was a bit young when Teletext was about and thought it just looked weird and ugly and never explored it, but since I'm older and Teletext is gone I'm sort of fascinated by it.
Did you use real teletext data to recreate this?