Hey, really creative idea and seems like a really complex project, so well done and hope you build on this in future! I played a couple of game modes - flower and prisoner capture, which i think were great little twists on the game. Im not really good at chess so wont be able to comment on the AI but mechanically felt good. The artstyle is quite pleasing to look at.
Not sure how this integrates the theme of the jam unless its something like inversion of the chess rules? but seems like a stretch :D Audio was missing, but once you add it, it will definitely give it a lot more feel!
In prisoner mode i think i encountered a bug where it sort of got stuck on the AI turn and i had to restart the game after a few moves.
Overall i think this is a really exciting project and quite unique, so I hope you continue to work on this after the jam!