Some advice...
Assuming you coded this yourself, heres some advice. Dude your engine plain dosnt work. I think i figured out your code shit just playing the game. Take time to create a hidden clip for every hit test. Instead of having a generalized one. Even if thats what you did, it dosnt work because you only set it to push the x or y back, but its easy to push back aginst it and walk right off the screen, tell the clips to move him to a certain x and y. Also put the hit test clip in his feet so you cant walk into the sky. Code more bettererer and it could work.
Hooray!