Q: Does this work on emulators such as Bluestacks?
Android emulators are incredibly unstable when using mod loaders. They may or may not work depending on your environment (or what day it is.)
Q: Does this work with game X or Y?
Lemon is currently very unstable and there is a high chance games won't work, but the only real way to see is to just try and hope it doesn't crash.
Q: Can I setup an APK to auto-install mods?
Yes, if you patch an APK with Lemon, then add a folder named copyToBase inside of /assets, any files in there will be copied to the MelonLoader directory
Example: The file in the APK assets/copyToBase/Mods/TestMod.dll will be copied to /sdcard/MelonLoader/{package name}/Mods/TestMod.dll.