You'll likely need to restart the game for everything to show up properly. Use WSAD to move around, and Right Arrow and Left Arrow to rotate the camera, Up Arrow and Down Arrow to move the camera view angle up or down, and =/+ and -/_ to zoom in or out. Thanks to JR01 for helping come up with improvements to the method and overall accuracy

As far as I know this was the first flowlab game to have actual camera rotation (well before it was added as an input on the Camera behavior)