Cool stuff!
I'm actually in the process of writing a game for my nephew, who is turning 9.
My game is going to be more about going to school and encourage him to have fun learning and socialising; perhaps shooting zombies, protecting/getting power-up from the school, collecting books for points.
He lives in a poor household where the mother doesn't want to do anything that isn't life-or-death. The kids (he's oldest of 3) are alive regardless of going to school,and the mother didn't need school, so there's a real need for some sort of external encouragement to push beyond that.
It seems trite, but I do wish that fortnite had some "stay in school" message, even just in the title sequence / main menu.