Click the circle, then you can save and load data. If you see the update screen, you have to refresh the webpage, not just clicking start again.
Version 2: added a mechanic to remove save data if the save data from the last version isn't compatible with the new version. So the player can play the game without any problems. Version 3: added a mechanic to force the player to reload the page upon an update of the game, so they player can stay on the latest version of the game.
