I can feel the mirrors edge inspiration. And the platforming is really tight you have to hit that second jump JUST RIGHT, or its off into the void! The enemy having an alert sound is great, Would be awesome to have something else in the level to motivate the players forward progression. The level design itself is a good start, you could extend the buildings down and give the world a 'floor' to better sell the idea of freerunning on the rooftops of city buildings. The crane was a great touch, but its positioning I think could be a bit better to align it with the running path of the player, as your trying to bring some of that mirrors edge feeling here, I think if the crane was positioned so you could jump right to the part you have to run up, or even jump on top of that first white part, and then to the path up it would preserve that momentum into the rest of the level. Finally a goal post at the end of some kind, weather it be an entrance to the building or however you want to flavor it, a goal point to signify the players success would tie this whole thing up nicely.