This doesn't seem to work well on my OnePlus 6T (Android 10). The + button can be 'clicked', but no other parts of the screen respond to touch (including the 'help' button). Pressing the + button does not do anything other than display the button press animation.
Hey! :) Quick update! I've spent the whole day today fixing the controller so it works on any Android device! Here's a video of the new build