It's really good, but the only thing I’d change is the boss's health bar — it should be big and at the top, because I can barely see it moving the way it is now
originally it was exactly like you said, big and at the top but I didn't like it. I want the player to look at the boss and not up, I think having to constantly look up is distracting and annoying, but this is just my preference, what you said is understandable.