Whew! Thanks for the gameplay animations. They solved it. I was able to get past the hole by running, grappling, and then jumping late into the swing. Before, I think I either was not running fast enough, or tried jumping twice (jumping into the grapple and then failing to jump out of it), or trying to swing or shorten the rope (ala Worms) to gain momentum.
Very happy to hear my game was well received by your daughter! Thanks for sharing that.