That music was really annoying, there should be an option to turn it off. Even still this is one of the first platformers on the site that are still up, but obviously that means that it had nothing to build off of, therefore wasn't that good. The controls were too sensitive, and the hitboxes were not totally accurate, and the attack button was buggy, and retracted almost immediately.
Not a terrible idea, but there were quite a few negatives to make this worse than it could've been.
PS: the boss was probably beatable, but it just wasn't worth playing to get back to it.