There is one part of the level in particular where the double jump does not always register:
I found a way around it which was by single jumping.
Have you noticed any issues with the double jump? Lastly one minor thing was one of the enemies is stuck in the ground and there's no way to jump over them without taking damage. Not sure if that was intentional or a small bug :P Oh and she slides when landing! Adds to the challenge but also not sure if intentional or not. Would prefer a more solid landing after jumps, but that's just me :)