The apk work a little different in ren'py. It creates a new version each time I package it. You can just delete the old version if you want
All good, but save files older than 1 version are obsolete with the current version and will not work correctly. I.E only saves from v0.07 will work with v0.08. I talk about which saves are compatible in the change logs. You can also jump to the act you want to start, when creating a new game, if you want.