That's alright.... And I also ended up with the same theory as you, that the problem is not only with Re'npy software version but also with Android 11 version... But I don't think the problem persists for specific devices..... It might be for Android 11 version users in general.....
And about the saves being ruined.... Ok I'll try to explain it to you with an example:
1. Let's just say I had v9 of VIRTUES installed and i completed all scenes in that version and saved.
2. Now I downloaded and installed V10c which you initially released and like I said in my earlier comment, there is no response after the opening page.... No matter where I touch on the screen....
3. Now after fixing a few bugs you release v10d, and again I downloaded and installed the latest version on top of the previously installed v0c. I open the game, the screen goes black and nothing happens for however long you wait. And then you grow impatient and you either uninstall and reinstall the damn thing and all your saves is gone and you have to start the game over or you try to just erase the data in the settings and try to restart the game and then the problem I mentioned on my 2nd point starts again.
