Hi ! It was cool to play, the level design is very well !
The principal point of improvement I see is the walljump : If I stop press the direction of the wall, the character is not in wall jump state anymore. So I have to press left and right and jump at the same time ! If the timing is not perfect, there is no wall jump. But even in this case, the left arrow have priority, so I can't wall jump to the right. (I succeed to finish the game with only wall jump to left, because you can wall jump infinitely to the same side)