I've played Mancala before, but it was a long time ago and I was much younger and I'm not sure I figured out/understood the strategy for it. Nevertheless, I somehow won.
I feel like there's a lot of text to read up front (rather than something more tutorial-like), and no way to refer back to it once I actually started playing. Clicking on the cards to see what they do is helpful, but it wasn't clear at first that that's how that worked (I expected clicking on a card to play it immediately), and it doesn't tell you about the cards the computer uses or the other rules. Also maybe some things would be a bit clearer if there were animation for the stones moving. (And I can click on the deck and discard pile but I'm not sure if it ever does anything. I guess you draw back to a full hand of three at some point automatically but I can't find anywhere in the rules that explains that.) (That said, I was able to figure out enough what was going on to win, although there was one time when it looked to me like the computer just didn't make a move and I wasn't sure what was going on there. It's possible it did and I just had forgotten what the board state was before.)
Aside from the lack of animation, though, the graphics, while simple, do look good and the music is good.