Is there any simple way to keep one project for my game and build for "standard" Android smartphones as well as Ouya? Or will an Ouya APK also work on platforms like the Google play store?
You could use a branch for each platform. You can detect the platform at runtime. OuyaSDK.IsOUYA(). You can store the Assets\Plugins\Android in your code repro in another folder and copy it to the destination when you want to build for OUYA. You can plead with Unity "why do you torture us" and get a feature added where you can pick the device in an easy drop down which finds Assets\OUYA\Plugins\Android and lists OUYA in the drop down.
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OUYA Inc | Android Developer
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