That's awesome! I hadn't heard to melonJS before - it looks like it gives you quite a bit to start with, so that's nice.
I also like that part of your motivation to do this is to help motivate your son :) I did a very similar thing with mine while he was learning numbers... he helped me design and build a really simple game, and he loved seeing his ideas come to life!
Good luck with the rest of your 7 days, and I'm excited to see how it turns out!
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