I don't understand why the default seems to be using arrow keys for movement, instead of WASD. A gamepad has the movement controls on the left hand, either d-pad or stick, and for PC games, using WASD for movement is standard. Using arrow keys swaps the hands, and thus makes it less intuitive to anyone with gaming experience. It's the equivalent of forcing anyone who comes to your website to switch which hand they use for their mouse.
At the very least, just support arrow keys AND WASD.
At the very least, just support arrow keys AND WASD.