The controls should  be :

 A , D and BackSpace ?

Or

Arrow Left ,Arrow Right and BackSpace ? 

I would lean towards A, D, and BackSpace, myself; though, if it's easy enough to do, perhaps both options simultaneously!  

I think A, D, and Backspace are quite of rough at first but it can get more comfortable than Left, Right, Backspace (which might feel a little bit tight) in my opinion. It also might depend on the speed and pace of the game probably?

But yeah, i agree with bispinosa