Oh wow. Amazing characters and smooth animations. Kinda fun idea to make the gameplay be based on chess. Somehow I really enjoy Kate's looks.
Aside from that maybe it could be more clear from the get-go which piece is which. Perhaps hovering mouse over them shows if it's a pawn, knight, etc. Also could there be an un-do button in the future? But that's probably hard to implement.
Great work so far looking forward for more to come.