Awesome, thanks. I'm glad you're enjoying my little game. I've spent way too much time procrastinating customizing the instructor myself, haha.
I would love to see the video when it's posted.
There is an official "quit" button in the pause menu in every lesson. You can find that by pressing esc and I did mention it in one of the early dialogs. I should probably add a quit button in the science chamber as well ( an oversight on my part), but the progress is saved as you complete things so you shouldn't loose anything even if you close the game in other ways.
I will definitely keep updating the game, I already have an extra level done. Comments like this really help the motivation going.