I do appreciate that you went with a cleaner nes style instead of the distorted sound they had. Usually when they say "nes style" there's that classic distorted bit sound. Definitely would have kept me pumped during the fight.
This Harry guy sounds like it would have a good fight, probably would show up multiple times and have a second theme which would serve as his serious, last fight theme. I like the simplicity in it, definitely will get stuck in my head for a while.
Edit: Mistakes lol