I've created a programming language and game for (my) kids called Stacky Bird. You learn Stack Based programming with Flappy Bird. Inspired by my old HP calculators, the game 2048 and Flappy Bird. In levels you earn a new instruction and at the end you have a complete instruction set, and can solve complicated puzzles. With new instructions you can even go back and solve previous levels more elegantly.

It's not mobile friendly yet, but maybe that'll be a next weekend project. At least you can view a video of a level on mobile.

My kids are loving it.

https://game.stackybird.com/ and the source https://github.com/jtwaleson/stacky-bird