Please, add freely remappable keys.
Never, ever release a game without that option. Genre doesn´t matter, Indie or Big Studio doesn´t matter, just don´t do it.
Take me for example, I´m left handed and from germany, so not only does WASD, Shift, CTRL and stuff like that not work for me, neither does Z to take cover since Z and Y are swapped on a german keyboard.
It´s an awesome game but that missing feature needlessly pulls it down for me.