Since Steam has now let us emulate Steam Controllers functions with any type of game controllers, it is now possible to play with a 360 controller natively in steam without the need for 3rd party software.

I took inspiration from the controls on the Dreamcast port, since the Dreamcast controller was the grandfather of the Xbox design, so you can pull right trigger to crouch and high jump with A button just like in the Dreamcast port. However left and right camera panning is done with right analog stick.

To access the configuration you will need to run and start the game from within Steam Big Picture Mode.

To do this start up Big Picture Mode as normally, then click on the game/manage game options/controller configuration/browse configurations. Once you do this grab Anthony817's configuration.

Please note: The game will always run from within Big Picture Mode when a 360 controller is detected with this method. Even when starting from outside Big Picture Mode.

Here you can get an idea of the controller layout with default keyboard controlls in game.