The part after the letter from the king is just plain mean. I kinda lost interest in the level after the fith time I had to first kill myself and then do the labyrinth again because it was impossible to reach the checkpoint in that tower after the elevator (the line of the platform makes you jump backwards, you can't really control the jump) and I kept falling down again and again.
you have to hit the boulder with the dot (the dot moves only on the circles) and get it fall down to break the line -> you can enter the next room which is a bit more timing based challenge