I was about to say it wasn't much of a boss fight until you said that it fits will with that kind of quirky boss fight and yeah, I know what you mean now, lol. I'm pretty sure I remember boss fights like that from the Paper Mario games where they had some battles where the music grooved like this
Definitely got the Halloween feel to it with that nice groove to it and that classic 8-bit feel. This was a lot of fun to listen to!