Hi, I can try to help a bit.
1) You need to keep the android.keystore and bundle.keystore in the same directory as the rest of the game, so next to 'NastyLand.exe". When you are ready for release, use the 'Build Distributions' button to make the Desktop versions. This does not package the keystore files.
2) When compiling the android build, you should NOT change the name of the package. You currently do 'nastylandpublic.v01.nov24.apk' but this is the NAME of your project. Thus when you change it the next time to 'nastylandpublic.v01.5.dec24.apk', the entire app is considered a different app. I'd recommend something like "nastyzeus.nastyland'. Renpy will still give you an apk named 'nastyzeus.nastyland-1.1-<randomNumbers>-release.apk'
3)You should not have to move everything to a new folder when you want to release. Renpy will create the distributions for you, like so:
Win/Linux: "NastyLand-Public.V0.1.1.Nov24-pc.zip"
Android: "nastyzeus.nastyland-1.1-<randomNumbers>-release.apk"
Mac: "NastyLand-Public.V0.1.1.Nov24-mac.zip"