Hey surashu, thanks for checking out my game!
Both DirectInput and XInput pads should work...did you try pressing a button on the title screen? If you don't show the game you're using a controller on the title screen it might not pick up on it. Also, does the pad just not work at all or is the mapping just messed up?
Finally, could you tell me what pad you're using? Then I'll try to look into it!