hmm. I fired it up and held my controller (Xbox 360) and my fingers naturally wanted to use the right trigger to fire the grapple and the right joystick to aim. not sure if that's the best combo, but it was what my instincts suggest to start with. movement with left joystick and maybe add the attack and an additional option to jump using the other 4 buttons.
I don't mind testing future versions if you decide to add a controller option after the jam (@johnstein on discord or message me here).