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There's a bug with the achievment. It is invisible but still clickable. It was preventing me from moving my purple node when I was putting it top left corner during lvl 13.
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Also, there's an annoying bug where objects that get moved too near the top of the screen get stuck there. Made worse by the lack of a "Reset" button...
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Level 12 is completable with only one bar. Put it to the direct left of the purple, watch the star fill up, switch to the right of green, let circle fill, star will have slightly decreased, switch back and both should be filled if you did it fast enough.