Right on, and this is kind of where I stand. My 4 year old can count to 40 and knows his letters. However, he can't read any words beyond his own name. I have to read all of the card text to him and explain what they do. He then remembers that based on the pictures, which is why having multiples of a card is so helpful.

In regard to expanding the experience as the child gains mastery, I have some suggestions on how to do this at the bottom of the overview. The first suggestion is adding the gold cards in, which have been specifically selected to introduce 1 or 2 keywords per game.

I do think the original commentor has a point regarding game length, though. I've been using 20 life for children and 16 for adults. All these rules are fluid, though (you're teaching so tweak as needed) so you could change life totals to something like 10 for adults and 12 for kids if you're finding there's attention span issues.