It's obvious that this is inspired heavily on Canabalt's sprite, maybe even too inspired...
Neck and the head should be moving accordingly. And the whole body should bounce up and down a little.
Frost butt you stole the words out of my mouth. Definately reminds me of Canabalt.
The torso and hips are way too stiff. Hair animation is a bit awkward. Pretty cool though otherwise. Reminds me of canabalt.
The animation is smooth but I prefer without BG.