The amount of challenge is very good. I like the idea of reseting the double jump/dash on a kill. The aiming is a little off, however. I also found it counter-intuitive to have the camera angle move when I start wall-running. I aim for an enemy mid-jump but when I land on the wall, the aim moves and now I have to re-aim during the wall-run.
There were minor issues of landing on invisible tiles while falling off the platforms. That's not really a big deal though.
The length of the dash was fenomenal!