We recently received a few reports of players not being able to play the demo with their controller - the game simply wasn't recognising it. Absolute tragedy. The issue was if you were to use Steams Input override, it would cause the game to not recognise your controller.
Apparently it's been happening for a long time.
BUT DON'T WORRY IT'S FINE. Turns out - was some annoying Steam Input settings with the demo, and now you should be able to enjoy the game with a controller (as it was intended), regardless of your Steam Input Override options. Huzzah!
P.s. very sorry and mad respect to ya'll who played on a mouse and keyboard.