Not bad...
While the SCORE may sound unfair, I've my reasons to do so (which I'll explain further).
I know a lot of Newground users don't like people who think different than them, and since this got in daily 3rd place, I'm very likely to get "useless" in my review for doing some Constructive-Criticism. (which is actually a lot more useful than "lol, gr8 game!" or "I luv it!")
º Sprites:
Re-texturing characters from street fighter 4 is not really bad, since you also changed their attacks. (there is no difference from this and editing sprites)
The biggest issue here is that they look weird in the background and the select screen.
You should edit the backgrounds in order to make them look better.
Also, you should try editing "Ken"'s sprites that appear in the "tutorial" screen. There is a lot of "noise" around him.
º Gameplay:
While the game is not bad, it's really slow. You probably played a lot of MVC or KOF, so you should be aware that dynamic is the basis of every fighting game.
The code is very good, but the fights are not swift enough.
º Sounds: Meh, the music was not interesting. The sound effects were not great. And some of them are very easy to associate with other games ("level 1!").
You should try to work on this a lot more.
ª Layout:
Both, the layout in the intro screen and in the battle look really, really bad. You should get someone to edit them for you.
Also, the mouse buttons are somehow unresponsive.
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Besides the things that appear above, the game was good.
It's not "a new version" it needs, but "a good polish", so to speak.
In my opinion, you should try to get some "artist" and "music composers" to help you.
There are a lot around the internet, and since this game was released, I guess a lot of them are willing to do it for free. =3
All and all, I hope you keep on making games.