Interesting concept. I liked the method how to eliminate enemy game pieces and how the dice number affects to the score. Enough extra lives was also given for a number change. Still, consider adding a number changing element without depending on dying as it would make easier to avoid dead ends and game over.
Some bugs were present during the gameplay as the game would freeze for a short while randomly and each time when enemy fires. On the level 3 (after the first teleport/bonus level) you could get a dead end with the shootable wall. My dice number was 2 and the wall had 1.