Why is this game so popular? Even if it's a good game it's also outrageously broken, in more ways than just the whole 'left screen destroys browser' thing.
Heya, there is an autosave system already in place but, as with a lot of web games there is always the risk that the cache of the browser/game is lost.
Unity does not allow a webplayer game to create/modify files on the user's computer since that is a big security risk (think of apps that could erase your stuff) so a save string is required in case you want to have a backup of your save.
Sorry for the inconveniece:)
NOTE: if the game doesn't autosave, please check your webplayer settings (http://unity3d.com/webplayer/setup)
they do have a separate cooldown, but if you switch after another element is casted, it will cast the other element without lucrea having to return to idle status.
Thanks a lot! Hope you keep enjoying it in the future :)