Hi there! This is the first time I have heard about the data files being gone after an unexpected shutdown. Do you mean the saves are gone? If the game closes unexpectedly, it is usually related to not having enough free memory left. Since we are working on Unity instead of RPG Maker now, the requirements are lower as it's better optimized.
I used to love Fullmetal Alchemist back in the '00s, so I could have subconsciously got some inspiration from it, haha. Thank you, and sorry for the inconvenience.