Hey it's me V0rt from the future, this method is actually not great, sometimes it only picks up two key inputs at a time. I would recommend trying to find a better solution. Default Controls: Arrow Keys to Move Space to Shoot >:]'s
Small proof of concept on how customisable keybinds could work. Might put this is Red Guy Kills. Let me know if you think it works, because I think i noticed a slight bit of input delay. See inside for an explanation.