Same problem here, the download just stops midway for me, and even when I manage to download and install the apk (through incognito mode), it gives an error when I try to play it. "There was an error parsing the package" or something like this. I also play on Android 11, and it seems like its not uncommon for Renpy to have problems with newer android builds, but seeing there are many VNs that work with it, I hope the devs take a look at the problem and try to solve it.