Just as the description says, it is a relaxing auto-jumper, perhaps a bit too slow for my liking. The audio and stage backgrounds really shine in creating a chill atmosphere for the game.
If I may give my suggestions, I believe you can add a secret/hidden function or ending to collecting the butterflies? Considering how they can be collected just like the moons, it doesn't make much sense to have them do nothing and not be counted in the ending/results screen.
Overall good work!