Left-drag to orbit · scroll to zoom · right-drag to pan
W A S D move
Mouse look
Stick to move
Shift run
Q / E change floor
V first person
Esc exit
Ground floor
Walk through the building
Pick who you are walking as. Move with W A S D and look with the mouse — or drag the view, or turn with the arrow keys. V switches between over the shoulder and first person, Esc comes back out.