sweeet :)
this will be one hell of a series, i'll tell ya that.
The graphics are bloody good. There is an excellent mixture of 2 and 3D graphics. And both kinds were made very well. The characters were drawn very well, as was the movement of them and their weapons. So the animation was also good. so well done on the great graphics + animation.
Sound was OK, and as you said, no music. But still, the existing sound effects were pretty good. But yeh, add that sound, boy. This movie will be much better if you include some music and just a few more sound effects.
The movie had a great style to it. The animation was smooth and fluent, and nothing about it was dodgey. so a nice style.
Violence was great. That ninja dude sure does have some skills! heh. Although it would be better if the enemies had a more 'proper' death, the deaths at the moment are ok. (we want more blood and guts, damnit!) so a great amount of violence in this movie.
Overall, you have made this extremely well, and i cant wait to see the full, finished project. Because it sure will be great. Just make sure you add that much needed music, and a few more sound FX here and there. Good luck, and well-bloody done.
overall score: 8/10
(THE THUMB: UP!!!)