This game is incredibly unique. I really like the overall concept. We need to rig the game in our favor without making our opponent suspicious. Such an awesome and unique idea for this theme.
After playing around for around 20 minutes I realized one decent issue, if you roll a 6, then roll a 5 for your opponent, you can continue to roll 6 for the rest of the game and win automatically. I am not too sure how you would fix this unless you bring more variables into play with perception and paranoia. Either way though, this was so much fun!
Great Job!