Arrow keys and WASD @BinaryCoder asked me to add an FPS-Control system in a game I made to this so I did. Change the slider range to your liking.
IF YOU ARE DOING RUNS USING THIS SYSTEM IN TURBOWARP, PLEASE CHANGE THE DAMAGE BRICK SCRIPT ACCORDING TO THE COMMENTS INSIDE. the original system is here: https://scratch.mit.edu/projects/1365333530/