I wanted to do that but I don't know how much memory that would take up with the extra frames. There will probably be 30-45 of these units on the screen along with other stuff, but even then I imagine the extra keys will not have much impact. I'll add some leaning and general movement to the body.
I have also make an breathing animation that I had planned to mix with this animation, but I can't seem to find a way to preview the mixing.
I'm making the game in Unity so I can't put it in-game until the runtime comes out for it. (I'm in no rush though so don't rush it).
Thank you for your criticism, I will update the animation.