Hiya! Unfortunately with Android issues, the problem is almost always is the device and not the game. If a save file is corrupted, it's not possible to recover it.
To save time, you can go to Options -> Skip Unseen Text to quickly get back to where you were in the story. Should take a few minutes.
Don't worry too much about the choices. All choice combinations lead to Chester's route. If you want Darrell's route, you just either have to pick the edgy outfit, pre game with Cliff, or get wings with Darrell. Just one of those 3.