Thank you for the feedback.
I suppose I really made the exit for the bottom left are not so obvious didn't I? Other players complained the same thing but I forgot to give a hint about this. You had to go to the left and climb the floating islands. The player can jump 3 blocks high and around 5 blocks horizontally and reach a 3-block-high ledge.
P.S.: Hate to break it to you, but the sheep sounds are actually the same sound. Their pitch is just randomized :)