You can only bounce off the walls of platforms, not directly on top of them, some jumps are impossible to make if only using the walljump, like in Checkpoint 0-1, the 3rd platform you stand on is too wide for you to make it to the other side, so you could add the ability to jump on platforms like that for it to be possible, but only once.

Example

this would just be too confusing, and wouldnt be competitive, but tedious

Would be for a neat challenge