Adding a tutorial to a game during a three-day jam is unrealistic! I read the description before playing, but I didn't remember everything it said. Luckily, I remembered reading something about coal, reread it, and played a second time with shuffling. Only then did I write a review.
Why wasn't I impressed? - Perhaps because in the second session, I had little experience with shuffling and used it at a different time than a professional player would. So, yes, I had trouble removing the coal. And I don't know how much better an experienced player would have done.