Beautifully presented, with the paper background and hand-printed looking letters giving a really tactile feel as if the die really is rolling across the page. The serif font and relaxed background music gives a kind of sophisticated atmosphere :)
Gameplay is great, and as others have pointed out the tutorial is superb, introducing the mechanic really well whilst functioning perfectly as a level in its own right.
I found that there was a slight delay before each level recognised that I'd won - not much of an issue as I knew I'd done it and it wasn't a long wait though :)