I think it's very well done. Very complete and informative. Discovered some alert sounds i did know ! Well designed too.
I think it could be shortened in some part tho, these when the mouse goes from sound to sound and there is no naration. Makes it a bit too long . Also the naration is a bit fast, but that's because i'm not a native english speaker maybe.
Must have been some work .
Reminded me i used a startup sound on a very short video :https://vimeo.com/197266185