While the mouse is clicked on the viewport and held...

• WASD to move the camera horzontally, Q/E for down/up.
• Drag the mouse in the direction you want the camera to turn.
• Hold either shift to make the camera travel 5x as fast.

Additional Controls:

• Ctrl + click (in the window) to "select" - currently not implemented other than displaying.
• Resize the frame freely be dragging the anchor in the bottom right corner (doesn't work on mobile).

• When holding a key down and dis/re-selecting the canvas with a mouse, those inputs will not be available until also released and re-pressed (usually not a big deal).
• Accidentally highlighting text when dragging the camera around can cause funky movement behavior (try fullscreen mode for large camera movements).
• Lower resolutions and samples/pixel/frame will result in better framerate, but in the case of the latter, longer convergence time.
• When simply waiting for a render to finish (not modifying the camera) there is no reason not to crank the samples per frame in order for the computation to run as fast as possible.
• Scenes with higher contrasts in lighting or relatively small light sources that are very bright will need much more samples to converge.