It's intended for mobile. The keyboard controls are added only because of WebGL that can allow for more potential playtesters, who, I have found out have been expecting WASD and seem to refuse to use the virtual joystick by dragging the handle with the mouse.
The A/D and Q/Z keys use the exact same code as the virtual joystick. So it should feel the same as the virtual joystick, well... at least to me. Note that the A/D and Q/Z keys are for direction control or look only. You have to hold the W key with the A or D key together to control the direction. You press/release the A/D key when needed to change direction while holding the W. Or better yet, simply hold the W key and use the mouse the drag the virtual joystick. :D Yep, to a total noob non-gamer like me, what feels natural does not feel natural to the average gamers, and vice versa. :(