When you have the previous version 19.05.05 you can download and install the new version 19.05.21 to update your files while keeping your saves. Only when you have an older version this might not work since I switched programms a while ago and they're not compatible with each other.
"To my shame I have to admit that I messed up the previous android version and made it not compatible with the version now or before it. All following android versions should hopefully work again to be installed over another and keep their saves but that's not working with the 19.04.05 version. Sorry about that."
~RyenSaotome
Found this on other comment. I have the 19.04.05 ver. which means I have to start over. I really do enjoy your game and appreciate the effort you put for this game so I'm not gonna complain. On the plus side I get to experience this great journey again which is fine I guess.