At the moment we do use Google Play Services, so unfortunately distributing and maintaining on other Android-based operating systems that don’t use Google’s frameworks isn’t possible. It’s a lot of work that we don’t have the resources for, and that wouldn’t be of benefit to a significant amount of people, especially since Amazon don’t make phones themselves. The target market would really only be Amazon tablets (and we don’t officially support tablets) or people that have flashed modified Google-free versions of Android onto their phones, which is a very small amount of people.