I've only just quickly gone through the first two stages (each stage is fairly substantial with both a boss and a miniboss), and so far I can already tell it's hitting all the right notes for me.
It's not ninja gaiden to the core, but never pretended to be that either. It's a bit more platforming focused (think Shatterhand or Mega Man) but it has the right elements. The sword slash is short but precise, and feels good, most zakos go down in one hit.
The level design is nice, and the enemies are very well designed, with some good ideas thrown in. It really feels like a game designed specifically for me and my tastes.


It has a few secrets to go for, and it doesn't seem to have a lives system as such, at least not playing on Normal Mode. So as of what I've seen so far, no notion of a 1CC clear, though it feels like it is built with one in mind, and I'm curious to see what will be unlocked after the first clear.
I'm not sure what the consequences are, if there are any, but there seems to be a few things you can do which the game makes notice of. For example you can destroy the little robots that are sent out to give you exposition dialogue, and there seems to be unique things to go for with the stage bosses at least. For the first one, I quickly discovered a super easy way to cheese it and end the fight quickly, and the guy subsequently commented on me fighting without honor for doing so. I thought that was pretty cool.