One of the great thing about the level selection menu of the Snakebird games, is that usually multiple levels unlock and once. So if you're stuck on one level, you can try one of the other ones and come back to it later. Unless you're stuck on Level A, in which the order of the fruits you want to take, is the middle one, the left one, then the right one. :)
I'm actually wanting to avoid posting the walkthrough myself, as I think it would be nicer if other players got the chance to do that themselves. Besides, I wouldn't want to ruin the experience of solving all the levels for the players.