This is so neat! Seems like a really fun game, and I'm also a big fan of the very straightforward & minimal website. Would definitely buy one of the decks you're planning to sell :)
The 300 decks arrived yesterday, and we were super excited with my daughter. Today we played multiple times and its super fun. Even though we played many times when I printed the game on normal a4 paper, having the real professional cards really make a difference.
I plan to also make lisp, c and javascript decks so we can explore more paradigms.
I have tried teaching coding (several approaches, but eventually on Scratch) my 9yo nephew, but ran into many issues. For example, trying to debug a counter, I thought it'd be fun if I asked "hey, what's 7 - 2", and he went "it's 5, duh" and then I went "and what's 2 - 7", ... and he went "that's not possible!"
Turns out his math teacher hasn't yet introduced negative numbers! I had to go back to number line...
Anyway, what you've done is really cool! I'm sure once he's old enough it might prove to be very useful.
The whole game was her idea and we started working on it about 5 months ago.
One other thing I wasn't sure about it from the web page was how it was a game. I got the impression that it was basically just a set of python programs/ideas and you pick one at random. Is there anything game-like going on or is it just that?