You could have also learned how to edit the saves to give yourself the radio :) . A tall ask of an 8-year-old of course, but not beyond the realm of possibility. Funny you mention Bennett Foddy's Getting Over It, because that's kind of how I "beat" it. After about 6 years of on and off attempts that always died around the church, I got fed up and edited the physics constants to make the game significantly easier. Since I used my own skill to hack the game and not an outside patch, I consider that "beating" the game in a sense.

I am now thinking if you can pull off an adventure game where some puzzles require editing the save file. It would be pretty tricky to make it understandable to most people. Now that I think about it, I wouldn't put it past Deltarune to eventually have an easter egg that can only be reached from a save state, which is impossible to achieve through normal gameplay. I know it doesn't have one right now, because all the scripts have been examined in depth and nothing like that was found.