Replied in the discord too, but- There's no autosave built in by default, you can call E.Save(int slotId, string description); at the end of OnEnterRoomAfterFade() in each room if you want it to auto-save when entering a room though.
In the feature list I called it "Automatic save/load system" more meaning that the developer doesn't have to manually flag each object/variable to be saved, that part's automatic.