First of all, props on the art style. It reminded me of stopmotion animation. Really beautiful. I've seen similar games, yours definitely has the most beautiful art style.
One piece of feedback though: Two opposing sides of a die are supposed to add up to 7. So 3 is supposed to be opposite to 4, and 2 opposite to 5. In your game, 3 is opposite to 5 which is really confusing. Especially when you can't see any sides of the die except the top side. It forces the player to memorize the sides which is not hard when the die follows the opposing sides rule, but gets a bit tedious when the die has random numbers on the sides.
All around, great job though. My game has a similar idea, though we used a 2d style.