Cgsx1: Indeed, high scores are meaningless in Ninja Spirit because you can rubber-band the controller at certain points, walk away and max out the score.
I did this back in the day for an EGM/GamePro/whatever contest back in the day.
I can 1cc PCE mode, but I usually make clumsy/stupid mistakes in Arcade mode that make 1cc elusive.
However, it's really a matter of knowing when to advance slowly VS. aggressively rushing through...some segments are actually easier when you power through them (I know because I have tried trudging slowly through the entire game...)
The game is so much more fun when you're aggressive and rushing, and, generally, you actually have leeway to be a *bit* reckless due to the forgiving jump/float/attack/power-up mechanics. This is why I love NS so much, it's actually quite forgiving in many respects. As if the designers knew that it felt great (fun!) to sprint-n-slash. Yes, I proclaim a new genre: sprint-n-slash.