Ok so I took a look (Sorry for being dumb :P) Anyway, I took a peek and the animation is real nice. I’m only a novice animator, but I feel like you could exaggerate the head on some poses. When the toon’s head head moves back and forward I don’t see a lot of recoil. Also I think you can enhance the torso. When he twists forward in the end it looks like it’s only rotated on the X-axis. I think there are a few little issues with keys that can be addressed pretty quickly. It’s a strong action though.
Like I said I haven’t been at this all that long so maybe I’m wrong. Just some possible things to work on. Good luck!