The only way to lose saves is to either manually delete them from both storage locations on PC, Mac or Linux, or delete the game if you're on Android (the game/SDK literally doesn't have the functions to do it itself). In these cases you can't recover them, sadly.
In case you want to check, the saves are located at:
ANDROID: Android/data/com.domain.corruptedkingdoms/saves
PC: PC > Local Disk (usually C:) > Users > USERNAME > AppData > Roaming > RenPy > CorruptedKingdoms-1547378918
LINUX: ~/. renpy/CorruptedKingdoms/
MAC: ~/Library/RenPy/CorruptedKingdoms