What a fantastic platformer. It's fairly easy to learn and especially difficult to master. Even when you think you've gotten to a point where you can just plow through the floors as quickly as possible, the game says, "No," and hits you in the face with a hidden saw blade, or a flying enemy, or the challenge of the bosses each of the way through.
If I'm rating the game on a number scale, I'm probably going to give it in the range of 8-9 out of 10. But the game is not without its flaws. First, there's the hit box: it's inconsistent. Most of the time it's exactly as you'd expect. You swing your sword (or 'chuks, or whip) and you hit your target. But there are times where I see the weapon sprite contact with the enemy sprite and it does no damage. This happens enough for it to be an issue, but not so much that it's a game stopper.
The other big issue has to do with telegraphing. The enemies don't really do a good job of it, and you'll very easily find yourself dying or getting hit by the enemies and bosses because there's little to no indication of a telegraphed attack. Compound this with a double jump that's a little low and you'll find sometimes that you have to be perfect more often then you should need in some cases to proceed. (Edit: I just found the super jump after writing the review, so that makes some boss fights potentially a bit easier.)
Now these aren't really "big" issues in the normal sense; but in the context of the game, they can add up to some pretty frustrating moments.
All in all though, the game is a fantastic platformer with a super progression path and you should definitely check it out.