Update: the developers released another quick update on September 19th, explicitly supporting the MOGA family of controllers. The NES30 mentioned below, a generic Bluetooth HID controller, is also working. Well done, Noodlecake and RocketCat!
I've been playing the heck out of Noodlecake and RocketCat's Wayward Souls RPG-roguelike ever since it landed on Android. While the top-down action game does have some excellent touchscreen controls, there's just no substitute for a real gamepad.