We changed the name of the apk package for multiple reasons.
If you want to keep your saves:
- copy your saves somewhere else (on a computer, in a different folder...)
- uninstall the game
- install the new version
- launch the game once
- copy your saves back in the new folder
You can find information here (https://wiki.andrealphusgames.com/wiki/How_to_find_a_save_file#Android) and on our discord server.