It's a good start. The beat is strong and it is very flowing (just as Mirror's Edge). The only possible concern I could have is that the song feels pretty up-beat, and happy. I think of a Mirror's Edge related song to be more legato and chorale like. Most song tributes I've heard have a strong Epic feel, just as the game did. (to me at least) Other than that, It's a great start, and I hope to see this complete soon!
Please contact me if you would like to use this in a project. We can discuss the details.