This track goes to the "Bonus Stage" categories.

After collecting a required amount of coins and gems, a bonus level is automatically unlocked and you get the chance to soar through the sky and rainbows to collect some more coins, gems, and rare relics while being invincible to surrounding enemies.
I hope you'll enjoy this happy and upbeat tune!! :D
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Update: I've edited and added some parts on this track such as re-mixing some tunes to make more balanced sounds, adding variations to the drum beats, adding some details for the gaps between melodies, and turning the track into a loop!