Nice simple idea but rather too sensitive to control. Some non-interactive dead space in the middle of the screen would have been useful. The constant movement tracking makes it a bit of a memory hog.
Flash text boxes are notorious for slowing your machine to a crawl when they lose the focus. Also, many of the text boxes have been authored as ‘selectable’ which makes them highlight as you ‘click and drag’ your way through the interface.
I like the look but it’s just not very usable.