Really nice little game!
The music is genuinely awesome and I love all the colors used for the sprites. A way to quit out of the game or exit full screen mode would be nice, also a button to reset the level as there were a few times i got stuck in level geometry. And I think binding the circle attack to a separate button would be good as there are times when I wanted to whip in the air or circle on the ground. But overall it's really nice for a first project, I hope you keep making games!