Its good

10/10 for it so far as you said you cant get the sfx..

Animation is realy good and all so yeah, cant wait to see more, as for the story line..

You said he was a ninja, so i presume he can fight.. if you want to make it become a story then you can have him wake up and run to a dojo to find his master was killed by being slammed into the floor (a small clip will show this in a sort of, flash back) and he seeks revenge on who did, it, I haven't gone into much detail but yeah..
If you need anymore Ideas just message me or something, I could probs come up with more xDD
and cant wait to see more.. you have a fan :)

looks good

but thats all. definitely needed some sound effects or music... anything. very nicely animated though

good intro

looks pretty smooth so far :D
my suggestions are to maybe make the bridge a little more solid when hes running. also sound is a must when you do the finished flash. but looks pretty good so far :D keep it up

Cool

Once you get the sounds and mabe a quiet music for the running scene it will be a good series.

Could go places

I understand your problem with sound, and unfortunately, I can't help you there, but you could have at least tossed some music in the background.

The animation was pretty good, and I'd like to see this extended into a full-length movie