Bobby and Bonnie was more challenging than I expected, but never frustrating. You play a rabbit in a magical setting which although sparsely implemented more than made up for it in imagination. An intersting narration device: the narrator is your sibling, so they speak in the second person, like most parser games, but they are also right there next to you.
This game would be great for older kids but they might need some help with a few of the puzzles. The built in hints but they are not that helpful. There are a few stumper moments but the solutions are logical and can be derived from experimentation and exploration. Also required is some familiarity with Peter Paul and Mary.