I really like this! the premise is unique, the gameplay is engaging, and the art is absolutely gorgeous! some minor quibbles:
The fact that your opponent rolling cocked dice results in a softlock is rather frustrating and really breaks the suspense that the game works so hard to maintain. I really wish that players could simply reroll in that scenario instead of being forced to reset the entire match.
Also, while having the last opponent be the most suspicious makes sense from a gameplay standpoint, this makes Ms Valentine comes off as merely paranoid rather than a statistical genius, given that two or three high rolls in a row isn't THAT surprising.
If you were to expand this game, it might be fun to see opponents get suspicious if the player takes too long to select a die among other factors... (^_^)
All in all, a very fun and attractive little game. Keep up the good work!