Re: I don't see the purpose of this
I agree. In an age where we enjoy full colour hi def screens of "retina" quality, dumbing down to 5 x 5 x LED seems unlikely to interest any kids I know. I have a son of the target age, and he just laughed at this.
Some kind of sprite based game designer for simple 2D games might work, but kids today are spoiled for choice with computers in a way that us 80's kids couldn't have dreamed of back then. I wrote games and tried other things (on borrowed ZX80/ZX81s and then my own Speccy) because it was such a novelty; today that doesn't apply. I really don't know if I would have managed to get into programming if I had been inundated with the distractions of all of today's online goodies.
That's what we're up against, if we really want to interest the kids.