I stumbled onto something in Level 9 that was quite interesting. In the lower chambers there is a blue button. Push this, go down across the fire pit and up to where the floating potion is. Get the potion and stand between the blocks until they close. Push the jump button and will lift you to the top of the wall(out of the gaming zone!). Go to the right and drop down until you find the corridor opening(which is the back entrance to the exit!)
Pekka Kana 2 has few other level design bugs like this one I know several places in Rooster Island 1 and 2 where it is possible to jump over the boundaries of the level (and I bet Piste Gamez didn't exactly mean it to go like that .