In the code, do you check that the data was loaded before attempting to save it? I’ve often seen people make this mistake, where user data is completely wiped, because their datastore system (sometimes) saves the data before it loaded (which is usually the empty template)
Other than that, I will refer you to this reply and this reply, where I ramble about mechanisms used to avoid issues of data being overwritten, or duplication exploits being possible. Your datastore system doesn’t have any of those mechanisms, so I would encourage you to read about it :P
The resource seems nice, and it would be quite good if had those safety mechanisms, but I don’t think, in its current state, that it should be used for any game where a reliable datastore system is needed. But keep up the good work, and keep learning!