Veeeery interesting concept - fits the theme extremelly well! Art and sound was also really well made!
My only complaint is the AI - it feels extremely dumb and the only way to lose is to just play dumb yourself. Of course I'm aware how hard it is to create an actually inteligent chess AI, so imo you're perfectly justified :)
I would really love to play this game with more advanced AI (and maybe some additional, more advanced randomized rules?). One of the most creative entries so far!