Unfortunately I didn't add in any option to customize controls. You can plug in a controller, and that should work fine too, but there are no options for WASD. Sorry about that!
That was a planned feature for the game that would have had a whole slew of other options, like high score management, bug and glitch toggles, and some other stuff, but it never got implemented, so I took the text out. Even back in V0.36 that "settings" text was just there and didn't do anything haha