good job and cool concept. It does remind me on many other games (that have a grid in which you place numbers), but I don't know any game with that exact concept.
Let me know when you upload an .apk for android... then I'll play it all the time on the train to beat my highscore. Right now I'm at 430 with only 2 dice in the grid, but I have to take a break and get back to work. But I'll keep the tab and continue later ;)