Please note that in order for the game to be saved, you must use the save feature in-game (unless of course the game itself autosaves), then press the save button here (Or autosave must happen). These saves are only for in-game save files. If you want to be able to save at any time, use save states. Saves and states are saved in your browser's indexedDB and are automatically readied every time you visit the page. You only need to use export and import for backups.