I'm familiar with Mancala in passing but I never learned to play it. Still, putting a new twist on a well known game is always fun. The red background is a bit too bright. It's not to the point where it's uncomfortable to look at, but I would have personally preferred something more toned down.
Also, I found a funny way to cheat. If you make a bet, the game still lets you bet on something else while the roulette wheel is spinning. This means you can see where the ball lands and spam bets on that number while the wheel slows down. 