Not Much To It.
What I find this lacks is a new polished concept that would make it worthy of keeping around. If you're going to make something as simple as a dress up, you need to somehow innovate and add something to it. Right now I see a pretty basic interface and although it offers music, a reset option, and rotation, these aren't particularly new things nor are they really fun. In terms of creativity, being original or creating original content is out of the question.
What I suggest next time is if you're going to make a dress up, allow more than a small portion of the screen to be used, and present the instructions to the user before they see the actual stage. For sprite selection, have a drop down menu on a thin bar at the bottom, categorized properly and with sub-sections so even without previews of the sprite the viewer can identify what item they are spawning. This solves having to crowd the screen with a bulking interface. I also noticed that the music player would play two tracks at once when i pressed replay. This can be fixed with a 'stopAllSounds()' command in actionscript when added to the button movie clip for the replay button. Adding more of a variety of item would be nice too, for example add sprites from as many episodes and even fan parodies and tributes too. There are dozens of packs with tons of sprites and I noticed this only showed off a very small portion of them. With a more polished interface with better effects like the drop down menu, adding instructions before you move to the stage so it gets the viewer to read it, and using the entire screen as the stage, I think this could improve greatly. What i see many of these Madness Combat scene creators lack is organization and polished effects rather than creativity.