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Ah, I see. You shouldn't feel ashamed of your English though, it is really very good. In fact if I didn't know you were German I would have already assumed it was your first language. :)
This game reminds me of Super Mario World 2: Yoshi's Island. Have you ever played that game? I suggest you do, you could pick up some really good ideas there.
EDIT: By the way, I am still looking forward to defeating your challenge:
"I highly doubt that anybody who wants to finish the game will be able to complete it as it becomes so difficult."