The game is great! You've created some nice level scenery and the atmosphere was right on spot (ninja style :D). Game mechanic works well and player movement was fun to control. Other thing that came to my mind was that the enemies can be made more visualy responsive to player actions (so that I know when they're going to hit, or that I've hit them). Another small issue was that i have a different sized monitor so I couldn't see the bars and health.
Overall great game!