Good news! Android version(21.1) is out!
Added 2021-10-19 10:52:10 +0000 UTCDownload the Android version in this post: https://www.patreon.com/posts/bizarreholyland-40125874
Thank god I found the problem for why I couldn't export the Android version. It seems 2GB isn't really the limit of how big an APK RenPy can export. I hope the same problem won't come back a few months later.
