its a start
Needs sound effects for one thing. Background music would help alot too.
There also doesn't seem to be a point to him being out there. I don't feel any story going on. It doesn't necessarily have to be a fight, but there has to be some reason for what's going on. It just looks like he's attacking air and running in random directions.
And it's a good idea not to loop the animation. It should have a definite end--unless you have a specific reason for looping. So, add a start button or preloader.