Way way too long to run for attackers.
Only one ladder and one backdoor, and the backdoor is even longer to run for.
Once up on the walls there is only one way down, or a long run along the wall.
Its alot of running and not very much fighting, and most of the fighting occur around that ladder,
My suggestions are , shortening the attackers run, adding another ladder or two, or maybe a siege tower, and adding some form of ladder on the inside of the walls. Creating more access to the courtyard
