Thanks for playing and for the feedback and comments.
well... actually there were times when I took the collision off the wall, because that block was just a part of the ground, and if I collided it would be pretty easy to climb.
The walls were oozing over them to slide, no keys needed to be pressed.
Sorry for your frustration. And I'm also sorry about my bad English. I had to use a translator to make writing easier.
I will soon try to correct the errors you pointed out.