The art and sound effects/music are fine. The game is quite interesting visually. However, the background is maybe a little bit distracting.
Gameplay-wise, the game is a nice take on the theme. The only big downside I see is the time it takes to restart a level (the animations take too much time in my opinion).
Another downside would be the time it takes for a die to flip (it may seem short but when you have to do it many times, it seems quite long). And another one would be the camera angle, which doesn't allow to see that many sides of the dice. It would probably be better to choose an angle which allows to see at least 3 sides of the dice so that the player doesn't have to move them that much to figure out which face is on which side.
Also : I played in browser and in full screen mode, the game is quite a bit slower for some reason.
Other than those small downsides, the game is very dice.