It is difficult to find the right balance, to avoid winning too easily with the bingo, good luck :-) As suggested in another comment, you could indeed add a token when a chess pieces is destroyed. Or in order to force the player to go in dangerous position, perhaps there can be some cells on which the player can go to spawn a new token. A least idea that pop in my mind: there could be spawning chess pieces each round (or 2-3 rounds), making it mandatory to destroy them to not be overflooded, and try to survive long enough to win the bingo.
Yes indeed, AI is really difficult (and nearly impossible in 48h). We wanted to make a small AI for the movement of our die in our game, but finally it is only parametrized randomness.
For the wheel animation, ask to other guys, maybe it's just me being too impatient :p
Good continuation !