Simple, but at the same time hard game.. Simple because you undestand how to play it in first seconds. Hard to continue playing it after you undersood a gameplay +))
I would prefer to see dice's other sides of the dice (for example, as many others have done, schematically behind the dice) so I could look for the right side faster, and not remember how I turned the dice and where the right number is right now..
Besides that, a very well made game! A nice thing that you want to continue so you will beat your previous score. Nice!