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The game is unplayable. At level 15, there's a frozen lake to the left (you must go to the left to progress, otherwise the levels keep repeating), which'll collapse under your feet if you wander on top of it. Alas, there's a powerboat goblin which'll arrive from that direction, thus, damaging the ice. And no, you can't jump over the whole icy pit, no matter how long running jump you make.
So the game is impossible, period.