this is a really cool concept and something I can definitely imagine becoming a polished game to play against friends. I had this saved up to play for a while and im so happy i took the time to play it, this version of chess offers a whole new dimension to thinking about your moves and i really love it! There could be more feedback as to which of the two figures selected will do the move and which one will follow, I mixed it up a few times or accidentally moved somewhere, I didn't want to go and at times I think you have to think too far ahead (which some people like), but i would love to see a version of this game, where moving in pairs is an option, but not a necessity because it opens up a whole pool of new strategies and interactions!
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I thought about making the first one selected be marked in some special way (currently its possible moves are the larger circle), but unfortunately it's something I thought of after submissions closed. Had I had time to work on the game Sunday, it would definitely have made it in.
I'm hesitant on allowing single piece movement, partly becuase of the Jam theme, but also because I like the "united we stand, divided we fall" thing, which is one of the possible victory conditions. Like I mentioned in another comment, I have multiple ideas brewing (including playing against the computer)