Click to look with the mouse (Esc releases) · WASD/arrows move · Shift run · Space jump · C crouch · V free-fly (Space up, C down, Shift fast) · 1–7 jump to the views below · F full screen · M map
Left thumb anywhere on the left: walk (push further to run) · Right thumb: drag to look · Jump/Up, Crouch/Down and Fly buttons bottom right · views and ⛶ full screen along the top
For full screen on iPhone: Share → Add to Home Screen, then open it from there.
walking