The global mechanics work pretty well! The power-ups are interesting, and the score being calculated by the dices value make an interesting twist. It's a god thing by the way that this value is not random (for once!). It rewards risk taking efficiently.
I was surprised that the bonuses where permanents. I expected them to disappear after each round. it's also an interesting idea, making each game really different. But it creates also some balance issues when one player gets too much advantages or disadvantages. :)
Also small UX note: I like that the score is integrated within the game itself rather than a separate GUI! It's clever, and allow to easily know the score without losing focus on the game.
Overall it was a simple, but efficient take on Pong. Well done! :)