Hello, you don't need the silver coins to fix the door. The door is fixed, but you can repair the hole inside it with silver.
And yes, you'll lose your save.
Is there any way to back up my save file? Can I look for them in android>data or elsewhere?
Just download the apk without deinstalling the previous version of the game, it should save your files and just updtade the game. At least that's how it works for me.
I think in the creators post of the next update. Since the entire game is getting reworked, youre gonna lose your saved file
