Well you are improving, we just want to help you to your full potential by critising your animation, so you know where to do better next time.
I'd say use the brush, the pencil tool is, not rated highly amongst the best.
The run was quite good actually, some of the poses were wierd, such as when he grabbed onto the ledge, and when he was floating. What I did like a lot was the muzzle effect.
KEEP IT UP!