Very good game
My only complaint at all is that I want it to be longer. I guess that's a merit, in some way. Also, the action & animation were smooth & varied; I could tell you put a lot of effort into the wide variety of ways this guy can move. It never felt like I was always hitting a button to jump or punch someone, it's always something cool & different. Felt like watching a kung fu movie or something.
I think some new mechanics would add some depth to the game. For instance, you could do some really cool stuff with a life bar. It seems like messing up on most of the stuff the character does would be invariably fatal, but in some cases, it would be nice to have some breathing room, or even have varying degrees of success. For instance, maybe you're fighting someone, and the struggle bar comes up, but you only get 3/4 of the way through it. Instead of having to start over, you could just lose some life.
Bonuses, like an adrenaline shot that slowed time even more before an action, would make things interesting and could be rewarded for precise timing or something. Alternate paths through the level would be pretty cool, too.
I'm not complaining about the way it is right now, though; if the next one plays just like this one, I'll be more than happy.