Father to a two year old boy who loves playing with my iDevices.

Firstly, can you tell me in simple terms what's 'different' about it? Amazing Coloring Studio by Linqsoft Ltd. for iOS appears to be very similar. I understand yours is Android but is that really a differentiator anymore?

As for handling kid proof in app purchases, the popular 'Elmo Calls' app for iOS has a fantastic system which is a barely visible slider on the top of the screen which gives access to the in-app purchase menu.

Good luck with it regardless, I'm always keen to see people build decent apps for kids.