Ok. Wow. First things first:
Awesome game.Now, for bugs and comments and stuff:
--in the far corner of the underground section, I ran up the wall and got stuck inside. Shortcut or glitch? I could jump around a bit but couldn't get out.
--combos vs kills: it's flashy to get a 150 combo with a ninpo tornado.. but at times I've killed enemies in 4 hits, and that's way cooler. A ninja is focused on killing as quick as possible, not getting 20 hits.. if it takes 20 hits to kill then you're not very good at killing

. IMHO, maybe if you can manage to combo and enemy really long that determines if they drop health or ninpo charge, or something. I know in Ninja Gaiden you got points for long combos (shurikens ftw :D ). Something to think about.
Keep it up! Can't wait to get past the arena-room and fight the boss.
And can't wait for the second level.
EDIT: I keep getting the clone glitch

. Would make a cool special. Also, just crashed with this.
___________________________________________
ERROR in
action number 6
of Keyboard Event for C-key Key
for object Ninja:
Error in expression:nface.onit>0
position 7: Unknown variable onit