Hi,
If you're on PC, save files are stired outside the game folder in 'Users/<user>/App data/Roaming/Godot/app_userdata/REC
As for android save data must be stored somewhere in either Android/data or Android/OBB folders though starting from Android 11 or 12 the access to those folders has been restricted (needs root to bypass).
If you experienced crashes on Android specifically, then simply delete app cache (phone settings -> all apps -> find rec app -> storage and cache -> clear cache)
Hope this helps,
Cheers