I like the idea, its a lot of fun to play around with :)
Being a little nitpicky, I feel like your game would have profited from a stric grid-based system instead of a pseudo grid that uses the unity physics in the background, as it was easy to accidentally derail the dice and bringing it off-center which resulted in having to restart the level completely.
The music was a bit monotonous, but very much fitted the theme and served very well as a background music track! The style was also coherent, clean and simple - I liked it :)
The idea of "not being allowed to rotate to the side opposite of the red side" confused me a bit at first, completely without any explanation, but it was intuitive enough to get it after a few respawns! I imagine some player feedback or indicator would work really well at this point though!