[adriand]

> what's the monetization policy that would work for you?

Just make a paid app - it's that simple. I won't hesitate to put down 99 cents, or $1.99, or $2.99, for an app that my child will get enjoyment out of, especially if it has some learning value.

Speaking of learning value, I think a more sophisticated approach to learning would be useful. For example, the standard approach is to make the game involve numbers or letters, but I find my child gets bored with these. But he's fascinated with strategy games, so a tower defense game built for kids would be perfect for him. He'll just play it for fun but he'll be learning how to strategize, how to plan, how to react to changing situations, how to choose between different options, etc.