After reading your reply I also realised that it definetely is the difficulty that made it annoying for me. The game definitely needs a more elaborate tutorial as the sapling mechanic is pretty unique.
So in order to give more feedback on wallrunning I played the game a bit further as I had not beaten the second level before posting my initial comment. I love the grappling hook though there were a few tutorial messages that I didnt pay attention to as i was still in the process of learning the grappling hook and playing around with it. That may just be my horrible attention span but I thought that some of the tutorial messages were popping up too quickly.
So my issues with the wallrun were resolved as I realised that I had just misunderstood it. I thought that you had to constantly hold spacebar but then in the third level I realised that that was not the case. Again I feel like there needs to be more space to just play around with the wallrun, so that new players can figure it out more easily as in the current introduction to it you have to hit kind of a hard jump in order to even test the wallrun out.