By way of Nintendo World Report, here's some additional, better quality gameplay of Fuse Man's stage from E3 2018. Unlike past videos, this one takes us through the entire stage from start to finish. We get to see Fuse Man in action too. He's fast, furious and not afraid to dish out a high-flying Speed Gear attack. For a Casual Mode run, it looks like a fairly challenging fight.
All in all, lookin' good. October 4th can't come soon enough!
Thanks for the tip, Vin_Van_Voon!