A cool idea that is well executed. I like that where the dice fall is actually affecting the gameplay. I would have liked that how I shoot the dice would have a greater effect how they fall though but that is still a fun mechanic. I like also how the game get exponentially difficult as a spawn rate raise.
The main issue I had was the lack of depth perception. the whole background is black so this is difficult to see how high is the ground compared to the height of the space ship and spawn dice.
But overall I really like how clean everything thing. Well done!