Controls: click and drag on the scene to move the camera. Use the mouse wheel to zoom in and out. Press F to enter first person mode. Use WASD to move, Q and E to ascend and descend, and ESC to exit first person mode. When modifying the scene parameters, no changes will take place until "Generate" is hit.
Note: This is using WebGL2, so use an updated Firefox or Chrome (not Safari or Edge, see here)