Good, but buggy
I enjoyed playing the game... but once I got to the first boss, I got EXTREMELY pissed. He'd hit me with his swirling attack, and if I tried to run away from it, my acceleration was less than his velocity, so I got in a never ending loop of him beating the shit out of me. On top of that, I'm assuming that the times on which he uses he slash attacks is set, but it seems random... he'll walk across most of the stage before he tries to slash me again, no matter how close I am. A quick fix for the loop problem - make his knock back slightly higher so you get further away from him and can recuperate.
Another minor bug - if you die from an obvious cause, but hit "REPLAY LEVEL" before the option to try again comes up, then when you start over, the option to try again, quit, etc. pops up and stays there until you hit "Retry" on that menu set.