Meh.
As a traceur, I find that the flow of PK allows for the greatest thrill - immersing yourself in the speed, thrill, and danger of the moment. Now, I liked the IDEA of the game, as it was, in and of itself, fairly exciting, but the execution wasn't what a traceur would indulge in.
The problem is that you stop the game in order to execute moves, which absolutely kills any thrill that the game held at the point of movement execution. You pretty much take the speed out of parkour.
That being said, you did have a good idea, and I'll give you marks for that. For a good idea of execution, play the game Mirror's Edge - that should give you a general idea of what speed you should aspire to.