Have ya tried reading some philosophical books aimed at children?They're, to me, a treasure of great value. Remember, what the children like, the parents havta buy!
You could include adults too. Make the app exam-oriented. Human nature, exploit it ... in a mutually beneficial way.
Good luck and if my suggestions made ya rich, do name me as a contributor. No, I don't want a piecea the pie.
Remember ta be Hindustani about it!