An aframe component for "wasd"-like motion on mobile. Demo here: https://sour-lyric.glitch.me/

Many thanks to @yoannmoinet for creating NippleJS. This project is 95% NippleJS with a small adaptation for A-Frame

You'll need to include the script in your project:

<script src="https://cdn.rawgit.com/mrturck/aframe-joystick/master/joystick.min.js"></script>

Second, add id="camera" to your camera element, or create a new camera entity with id="camera":

<a-entity camera id="camera" position="0 1.6 0" look-controls wasd-controls>

Add joystick to your a-scene element

<a-scene joystick>

If you are using the joystick to replace VR controls, then you'll probably want to hide the vr-mode-ui button. Do this by adding vr-mode-ui="enabled: false" to your a-scene element (example below):

<a-scene joystick vr-mode-ui="enabled: false">