The game was tested, the double jump is ok. I don't think is a bug or something, I think you just didn't get the mechanic still =D Try it again and again, you'll get it. Hint: Wait a little bit after the second jump. Good luck!
Thank you very much for playing, for rating it and giving advice. The game can be hard, especially at level 5, but if you learn the mechanics you could do it in a few tries =D
