Fun submission.
I liked the theme of the game, although I did find the character and enemy designs to be a little... Familiar. It was nice to see a functioning health bar, however I don't believe the game presented too much challenge.
I did find that if you held in one direction, you would permanently fall out of bounds, and be unable to return. This would make the game unplayable if you happened to do it. To fix this, I'd suggest adding some invisible boundaries at the edges of each side of the stage.
Still, a fun submission to play, well done.