No mistake at all unless you got windows 8
I got it, tried it, theres nothing wrong with it, it runs even better than Windows 7.
Its just people who can't deal with change and a simpler look.
To minimize it all you do is double click on the top part of the window.
I think you can right click to minimize it and then you select minimize from the menu if I am correct.
Or you can right click on the Blockland icon at the bottom and select minimize.