The energy ball pops in, might be nice to bring it in a more interesting way? You might find it easier if you grab an animation from say mixamo as a base. the ball also pops out, could have scaled out as the beam is taking it's energy.
would be nice to animate the beam going towards the bug for a frame or two rather than being immediate. it also pops out, would have been good to errode it away from the edges.
the little lighting effects on the bug are very slow, lightning is very fast, every shape should only show for one frame.
everything pops out at the end might have been better if the circle continued to scale out as it faded away rather than stay the size of the bug.
I'd advise you to look into adding more elements to this because your drawing( where you've written bely flop :P ) is more impactful than what you've made. So I'd say you should look at more references, draw out the effect you want and then focus on recreating what you've drawn into engine and keep looking back at your original concept whilst working on the effect.
Best of luck - AF