Nice chance to take a known game and use it to really practice and flex your pixel art and animation skills.
I'm not good at Chess, but I'm pretty sure I ran into a bug where the game killed my king, but I'm not sure how the move was allowed to occur. The game had done a good job of not allowing me to move into check prior to that point so I think the movement/attack validation code might have given a pawn some extra movement for the kill.
It felt a little weird to me that the bishops specifically had unique character sprites between them while the other more significant pieces didn't follow that pattern. I'd say that it's probably better keep unit type visuals uniform for all units of that type, but unique bishops may just be a specific case from other Chess games that is a standard that I'm not familiar with.