I did find one download for the 2D version of Mirror's edge. but it was really slow at around 3Kb per second. I eventually got it, but as yet it's only 1 level in size, though when the game is completed there will be a lot more levels and it will still be free.
It reminds me of a mod you can get for Unreal Tournament 3 that converts the game into a 2D platformer and theres another that makes it look like a mario game, but you still get the UT characters. If you've got Unreal Tournament just go to filefront and or Google Unreal Tournament 2D (the file name is UT2D v2)