Canabalt with more buttons
This is a good game. And even though it's modeled after Canabalt, it definitely doesn't feel like a carbon copy.
In fact, in a lot of ways this is more like a platformer and less like a reflex game (which Canabalt certainly is).
For me, I prefer Canabalt because of its speed and style, but your game deserves the attention and has a rewarding learning curve.
My only real beef with the game: Sometimes when my ninja takes a swing on his chain he dips below the screen and dies even though I could have otherwise landed the jump. I don't know if this is an easy fix or not, but it would make the game feel a little better.