PLEASE if you are making a game, spend some time making controls re-assignable. "I can't walk and jump at the same time because default controls don't work for me and I can't change them" is a very bad feeling.
Related to this: If you still don't make them re-assignable, at least don't use Z / X / C. Z and Y are swapped on German keyboards which makes it basically impossible to play your game.
(seriously, fuck hardcoded QWERTY controls)