I've made an educational game for Windows Phone 7 with XNA - which is now a dead technology. But through MonoGame and Xamarin I have been able to port it to Android. Now I need it as an app for Windows tablets, windows 8 app or windows 10 universal app.
What is the best route to this? I'm using Visual Studio 2013 with Xamarin Business edition. And I don't know enough about my options. Should I start with the XNA version or the Android/Xamarin version? What template or architecture is best. Or do I need to do a complete rewrite (only keeping the C# business logic)?