Great start! Not much for me to add to the other posts here.

Some random suggestions:

Clear the table of unneeded stuff (distracting)
Better yet, put the camera on a tripod instead of loose on the table
Be next to the camera, not behind it (the tripod might help this)
Use the video camera focused on the GG to demo movements -- some tabletop still lives would be useful (get a lens!)
Try to cover the same info in half the time