@yagejs-addons/virtual-controls:
a floating stick (left half) plus action buttons that drive the same
actions as the keyboard (A/D or arrows, Space jump — hold it for a
higher arc, Shift dash). The overlay defaults to
visible: "auto" (mobile only); this page forces it on so
you can drive it with the mouse. Tap the backdrop to ripple — touches
on the controls are consumed and never ripple.