It made *FLASH* in my brain and I thought 'could it be the keys on the keyboard?'...
(of course after I tried everything in shifting the alphabet left and right and leaving the challenge alone for some time).
no, the challenge implies that you know the layout of a qwerty keyboard to solve it, since it is based on this layout.
But anyway, I guess most of the people using an azerty keyboard knows about the differences with others. 9 out of 10 flash games online use the wasd keys to move without the possibility to change them(while if you would move it one space to the right, most keyboards agree).
nice challenge, but doesn't take in account people with with non-QWERTY keyboards. I solved it using french AZERTY, I suppose no problem for german QWERTZ, but Dvorak layout should impose more problems.