It's a no-name USB gamepad and I'm playing on Windows. I can use this package to tell you the axes of my gamepad but I think I can try to set them myself in the game's configuration if you tell me what axes the game uses.
The game is using InControl, heres a list of supported gamepads: http://www.gallantgames.com/pages/incontrol-suppor...
Not sure how to use a custom one, maybe if you could use a tool that makes it work like an X360 gamepad.