Classic oldie.
I love Kefka, he's an evil guy (We are thinking of the same Kefka right?)
I'm not going to give you a great big list of suggestions, because this is a fairly old piece, and your skills have increased greatly since.
So I will give you my initial reaction, what you did good.
The intense piano speed was catchy and fun to listen to. The bass in the background really did some good, I don't think I hear this kind of bass in some of your newer songs, I think you should, it definatly adds flavour.
When the high pitched pad came in, t'was amazing, I loved that soft melody.
I've noticed that in all your songs, you have a GREAT variety of sounds, lots of external flavour, and this you've managed to keep up throughout all your pieces. This in my opinion is as important as melody, having different instruments convey different emotions and images is what can make or break a song.
Volume levels were good.
Track placement were good.
5/5 keep them coming.