It tried too hard
It seems to me that the best thing here was the animation. S-Man looked reasonably good, it would have been a bit better if his movements (like rocking back and forth) were a bit smoother and more realistic. While this concept has a lot of great potential, it seemed like you tried way too hard to get cheap laughs (what was all that crap describing his lightening ball?), which took away from the experience. So, I think that S-Man could be a lot funnier if you put a bit more thought into the storyline. Also, I think you've got the potential to be a pretty good animator, so work on that some more. Just trying to be helpful.