Add a confirmation to the resign button!
Can you add a permalink to share the game with my friends so they can see the replay?
(In one moment, the bot atacked my rock with a bishop, and the rock was totaly traped in the corner between the pawn and the knight :(. But after a few minutes of thinking, I used a magical curved path of my far bishop to stop the atack. It was very surprising to be able to save the rock.)
Permalikt to checkboard may be nice too.
When the bot is hopeless (like a rock and two knight down) it makes too many silly moves. Probably all the moves have 0% chance of wining, so it can't pick the best one. Perhaps a counting the pieces heuristic may at least avoid the very silly moves.
(In one moment, the bot could eat a knight, but it just moved the king away instead.)