Nice, really love the changes you've made, great work!
Love how the Fool completely turns the game on its head lol, although it sadly can't move after another Fool which should be patched
Also, I think there could be an option where you can't make a move that would result in you being in check because that's how chess websites usually are and it's a cool QoL feature
Oh yeah and the menu could have a continue button so you could change the settings mid-game