I actually played hanafuda because of this too. It's interesting, to say the least. I also noticed that there's a manga for this, I'm going to have to give that a read-through sometime.
Anyway, I think the film has a pretty nice concept. Living in a world where basically everything electronic is run through the same system, which is hailed for its outstanding security. It's a bit of a far-fetched thought, but definitely interesting. I'll talk more about it later, gotta get to work.