For progress on android you need to back up your saves first to make sure you don’t lose your saves. On windows they will carry over but android is the one you need to back up your saves before installing the new update.
From 0.6A from where you last left off there was 0.6B, 0.6C, 0.6D, and all of version 0.7 to 0.7.5. So there is a ton of content to go through. However at 0.6.5 there was an entire makeover of the game with renders, features, gui, scenes and a lot more. Because of that it was suggested to start a new save because saves from before it would cause issues.
At the beginning the story was adjusted to progress a little faster and some slight changes. So if you wanted to start over to get a refresher and see the new changes then I highly recommend it. Otherwise there is a save in the discord server. As for any other remakes to the story I don’t think there will be so I think you are fine. Glad you enjoy the game! <3