In the form of a controller, I don’t know about the rest of the ppl who played the demo but I didnt go very far before quitting. I simply can’t stand using keys to move, especially if the movement is on the right and the shooting is on the asdw keys. 
What I’m saying is, add some support for usb controllers or at least something along those lines. It would help some of us non pc gamers out to use something we’re more familiar with. And it would make your game a lot more enjoyable. 