Dynamic First Person Mobile (Test Build)

Make sure you download it on android platform. After you're finished downloading the file, it should appear in your download file as "FirstPersonMobile(TestFPS-Baked).apk", Just click it and you should be able to install it.

Incase there's a warning that says the source is not trusted or whatsoever, it's because the game is not from valid app store, so you could just deactivate the setting that blocks it.