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It was an interesting concept, but it felt like you put all the work into the actionscript and nothing into making it feel like more than a slideshow. The transitions you use are really choppy and can make a game look thrown together. No one wants to spend time playing a game if it looks like the creator didn't want to spend time making it.
Simple things like making the credits fade in/out at the beginning, or having the levels fade into each other at the end can work very well for people who aren't adept to flash.
Also, the colours really clash. The text and button look really out of place, and a black border and/or a lighter background colour could go a long way to fixing that.
Adding in some kind of enemy, moving walls, or buttons to change walls could give the players more to do.
An interesting idea though, props@u.