You're right and besides that, it's not an interesting game for them. I continued involving him using the same platform, but we made more age-appropriate games. It's easy to upload a different game over a USB cable so I could just remove the trading one and upload some other.

Some of the games we made were a quizz platform (times tables, French words etc.), a version of etch-a-sketch where they can move a cursor around, draw, and change the color, and a 2d space shooter game.

It was a good platform to introduce them to code on some of the more tangible bits such as explaining that the screen is a grid of pixels, and that hitting the move button means incrementing your position variable by a few pixels. It's also quite cool for them to be able to bring this to school and to explain how it works, both from an electrical standpoint, and for some of the simple software bits.