Yay! Got them all. Used to collect them when I was a kid, game gave me some nice memories :-D
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Glad you enjoyed it! Our kids had fun learning about butterflies for this game. They picked which ones to include in the game and did the art for them.
FYI, There is a hidden path with an additional made up "Nebula Wing" Butterfly. If you collect it, it will stay with your character, flying over their shoulder.