I could walk on some of them without holding onto the wall. I've seen a room where it's required to stand on those ledges to climb a few floors up but that shouldn't be a thing in some other rooms.

I climbed up a wall and got stuck in it. I had to jump several times to find an out. I have also had trouble with invisible walls. Sometimes a player would be able to climb something, but then the ...

On the second level, when you crawl along the wall, there is a chance you might get stuck in mid-air.

After climbing a bookshelf there was a small ledge on the wall that the character got stuck on and walked around the wall. Was able to jump and dislodge from wall.