Ooh wow, thanks so much for doing a Let's Play of the demo! It was a lot of fun to watch! And so sorry that your computer didn't save the video for the second half. That sounded super frustrating. :(
FYI, if you play again, there are shortcuts to save and load without opening the menu. Just press the Q key to do quick save and L to do quick load. Hopefully that makes it a little easier. Thanks again for sharing, and hope you enjoy the other routes if you decide to try them too. :D