This is my first attempt on a ball rolling type of game. In every level you have to do something to go to the next level. Don’t worry about your objective because the instructions are located at the bottom or top of the screen. Enjoy!
BTW: I’m only 11 so please tell me how to improve the game.
Great job for your first attempt! Here are my thoughts on how you might improve the game:
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The controls feel too sensitive and touchy to me.
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Don’t start the ball in a position where its first move is to fall off the terrain, make a nice big flat area where players can get the feel of things.
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Instructions information. Sure, I figured out WASD fairly easily but in general it’s a good idea to have them somewhere (your initial “press any key to begin” screen is a good place).
Those are my first three quick suggestions, the only other one I have is for you to keep at it! 
Thanks for the tips HiggyB! 
I am already making Soccer Ball Adventures 2 and I will do the things you suggested.