Fun concept and good visuals, but the utter randomness to the available numbers on the dice really threw me off. One run I'd have dice with reasonable numbers, next run I have a d8 that had a 21 on it... turned into just rolling that, hoping to get the 21 and win in one go. Some level of control over the numbers would help I feel, cause as it is I'd try to pick the dice to counter what my opponent picked, but I can't always tell which of his dice he chose based on the visuals given.
Still, was a fun experience. Well done.