My then eleven year old and me built one in Godot. I can not recommend it enough. The fact, that you can get to something, that has graphics and sound quickly,

My then eleven year old and me built one in Godot. I can not recommend it enough. The fact, that you can get to something, that has graphics and sound quickly, is just awesome. That it is beyond being an obvious toy (like Scratch) but used by grown-ups to make real stuff is a form of motivation you should not underestimate. I showed my daughter the Tesla app as an example, which was made in Godot back then. Finally, GDScript is similar enough to Python, that it will facilitate learning that later, I hope. We started this almost two years ago and came to a playable result quickly. We are still working on it to eventually publish it on the app store.