StepCodeGameMaker

// Key "W" Function, to move up character
if (keyboard_check(ord("W"))) {
    y -= spriteSpeed;
    image_speed = spriteSpeed / 3;
    sprite_index = spriteUp;
}

// Key "S" Function, to move down character
if (keyboard_check(ord("S"))) {
    y += spriteSpeed;
    image_speed = spriteSpeed / 3;
    sprite_index = spriteDown;
}

// Key "A" Function, to move left character
if (keyboard_check(ord("A"))) {
    x -= spriteSpeed;
    image_speed = spriteSpeed / 3;
    sprite_index = spriteLeft;
}

// Key "D" Function, to move right character
if (keyboard_check(ord("D"))) {
    x += spriteSpeed;
    image_speed = spriteSpeed / 3;
    sprite_index = spriteRight;
}

// If key not pressed
if (keyboard_check(vk_nokey)) {
    image_speed = 0;
    image_index = 0;
    spriteSpeed = 3.5;
}

// Key "Shift" for more speed move
if (keyboard_check(vk_shift)) {
    spriteSpeed = 7;
}