FYI for those searching for this on Android: (1) it isn't on Amazon yet (or at least I couldn't find it), and (2) to find it on Google Play, you have to search for Gabriele Cirulli if you want to find the actual game he's talking about. He links to the app in his post but, because I had a bit of trouble finding it, here it is:
https://play.google.com/store/apps/details?id=com.gabrieleci...