itch.io

I've no experience with the android version so take my advice with a grain of salt. I would imagine the best course of action would be a clean install of the game, that means uninstalling and then reinstalling the game. I had an issue early on with the game on pc when I was using the itch app (yes, I know, very dumb of me) to launch the game.

The auto updater prompted me to download a new update, which I did. However, this led to me being greeted by a black screen whenever I'd launch the game. I had to reinstall the game to get it to work again. Unfortunately, I didn't know about backing up my save data so I lost my progress in the game.

Idk how to back up your save on the android version outside of using the cloud backup function in the save screen so unless you do that, you may lose everything too.

Assuming you bought the game with your Itch account, you shouldn't have to purchase the game again. The game should show up in your library and the store page for it should show an install button. Like I said, I have no experience with the android version, so this might not resolve your issue. Maybe someone else Knowledgeable can chime in before you try.