I risked and it didn't delete my saved files by installing the new android app
Yah, thats the recommended way to update. New version overtop of the old so that the saves don't need to be moved anywhere and stay safe. on PC/Mac they're stored in like appdata/ren'py tree and perfectly safe from deleting the installed game files, so you can just install a new version. Mobile is trickier, because the saves are within the apps structure, remove the app and you remove the saves.