Yeah, no traditional controller support, sadly. It would be easier, especially for beginners. The inventory system could be easily (ok, it would be a lot of work) altered to support controllers, it's the animating a character to move in a way the works with controllers that would be difficult. At least as far as I understand.
Steam controller support will likely make an appearance, though. I don't know, but if What El Maco says about screen-relative control schemes is true, then maybe traditional controllers could see some support in the future. Pure speculation.