How to climb in happy wheels. Now, this is complicated to do. Try getting up to a wall. Pogo man is likely preferred as you can jump and grab the wall easier.
Now that you have a hold on the wall, hold down until you're halfway, quickly let go, and hold left (Or up, either way,) and hold forward and space again. Remember, this is complicated, you likely will not get it on your first try. And no one will judge you for it.
Big-boned characters can not climb as far as I know. In the event you got stabbed in an area between the legs, it may make climbing a little harder.
Don't worry, keep trying, I know you can do it. If this seems like spam, I apologize, I found out how to climb and felt as if I should let the whole world know.