Highly addicting.
But the game is really simple and most important, despite it's simpleness it's still really attractive and enjoyable to play.
Overall I'd give this game 4 out of 5 stars. I would take away one star mainly because of the lack of variety.
For graphics I'd give this game a 3 out of 5, because it's nothing fancy, but it's really simple and sweet.
And finally for game play I'd again give it a 4 out 5. Because as I said before, it's highly addictive only in the beginning. Though I'm sure that, when you haven't played it for a long time and start all over again, the level of addiction will be the same.
All in all, it's a very enjoyable and crazy little game.