Can I play it with a 6 button arcade stick? Or does it require the greater number of buttons/analog inputs that a controller has? If the first is true, I'm going to buy it right now.
EDIT: After asking on the Steam forums, it seems there are too many inputs required for a basic 6-button stick thanks to the d-pad being your items. However an 8-button stick might work once they implement the ability to rebind controller buttons, which is supposed to come in the first patch.