Several users on Android 11 have had issues installing the app. This appears to be a security change in Android 11, and supposedly, the newest version of Renpy resolves this. However, as I am unable to reproduce the original issue, all I can do is confirm that this version (as did the last) runs in emulation on the latest version of Android 11.

If you are an Android (11) user and haven't been able to play the game recently, give the newest version a try.