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Not sure if this happens with anyone else but my camera gets stuck in one corner or the other very often. This can make it frustrating to play when I can't see what's going the other side of the level. i.e. (enemies stationed, revenge waves, etc).
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It won't save if I close the web browser (or the browser window in which I saved). I think there is a problem with Ruffle.
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Unfortunately game no longer recognise I'm playing at kongregate(and I do as I write here :D ). Therefore 2 heroes and their unique cards are locked... probably for eternity, unless someone at kong update game or plug which is unlikely to be honest :(
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Yes, you can save with Supernova. It should just save normally after you click the save button. If it doesn't work, then I don't know why, but I would try using a different browser.