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Also, are there bad or sad endings? I don´t like reading depressing stuff, but maybe I´m missing out if they are lighthearted

Yes!  There are bad endings and failure endings.  The failure endings are still happy, but you need to learn to work the magic better the next time you play.  The other bad endings are pretty easy to avoid.  You won't 'accidentally' get a bad ending.  You have to pick some obvious choices to make them happen.  :)