@cublah
I hear ya’ 
I tried to find info on how to limit the installation only to Kindle Fire, but failed miserably. No info to be found on the Amazon Dev Portal or Google… maybe only the “Big Guys” have access to this…
@ doubleslashdesign
You have set a permission to record audio in your build.settings, and I just saw this on the Amazon developer Portal:
Will my app work on Kindle Fire?
For your app to work on Kindle Fire, it needs to be compatible with the device’s specifications. At a high level, it must be optimized for non-Google Mobile Services (GMS) Android 2.3.4 (Gingerbread) and a 7" screen with a resolution of 1024 x 600. Your manifest should specify support for large screens. Your app cannot require a gyroscope, camera, WAN module, Bluetooth, MICROPHONE, GPS, or micro-SD to function. In addition, your app must not be a theme or wallpaper that manipulates the user interface of the device or customize the lockscreen. As with any other app submission to the Amazon Appstore for Android, your app will also need to comply with our Content Guidelines.
I’m not sure but the permission to record audio might be causing Amazon to flag the app as incompatible with the Fire?
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