Amazon version is Kindle Fire only. They could've had my coins.
The comments don't seem to mention that. I saw a few people say "It works great on my phone" and "Exceptional on Sony Experia Z3". So it must work for other devices, besides Kindle Fires. Unless it recently changed that with an update. There's also no mention of Kindle Fire only anywhere in the description or the comments.
Maybe it's another screwy compatibility checker on Amazon.
Probably better off with the Google Play edition anyway. :P