Animating the back of the evil ball guy face/head thing, where the flames in the back light it up a bit, would probably make it feel more alive. I also think the transition between his natural color and the light from the flames needs a little more smoothing out.
The Earth looks a little too 'blobby' in my opinion, I don't think it catches light like that. I'm not really sure though.. It just looks a little odd to me.
Like Tuna said, the head, or the gun should rotate along with however the beam is rotating (and vice versa).
But I don't think you should make him wobble, it would just look odd that way.
What I suggest instead is a static, much stronger and powerful beam, than you have now, charging up and smashing right through the Earth. If you can convey a powerful build-up to the beam being charged, and then blasting it through the Earth... You've got gold.