Cool - Couple of comments.
On the Tile Screen, if you drag one app way to the bottom, it will also shrink the size of the start screen overall, making it easier to drag long distances accross many groups. I am finding this crucial, since my start screen is getting really long - over 70 apps. Which brings me to my next comment - Hopefully MS or a 3rd party developer will come up with an option to group tiles into folders as you can do on Ipads and Android, as app management is going to be an issue with the current layout and no ability to group into folders
Regarding the charging cable - I am surprised you made no comment how tough it is sometimes to get the magnetic connection to seat properly and start charging even though it appears to be connected - I think MS failed on the design. Apparent in your video when you are using 2 hands to get it seated correctly. I had heard this can be fixed by filing the sharp edges of the connector but have not been brave enough to do it yet.
Other than that - Good job - Keep them coming . .