Alriight, it was implemented, but it looks like I disabled and didn't reenable when releasing.
Viewing post in Smashing Simulator Idle comments
If I update the game right now with the export feature, it'll wipe everyones save (since it literally will not be able to access the last save) and there doesn't seem to be a fix around that. I'll hold on to that till the next update.
For the saves failing to load, which is a seperate issue, I'll add some sort of a window warning that the safe failed to load and to send me the error.