I can tell you from experience, PICO-8 has enthralled all my children, especially my oldest, with how little is required to make a really cool game like Jelpi. Every time we realize yet another cool thing you can do with just cos, sin, and atan2, we're always floored. Maybe we're simpler people, but my children were aware of modern video games and web apps, and somehow they still are fascinated by it and the oldest one has mastered it by now.