Extremely creative concept. Seems like a game that was truly born from the tileset; a worthy representative of the spirit of the jam. The pressure to keep moving towers and the pawn promotion concept were particularly inspired mechanics. Difficulty was a bit easy. I invested in promoting a legion of queens and felt pretty unstoppable. The only danger to my forces was that I was almost killing waves too fast and not having enough time to move my threatened pieces. My biggest criticism IMO is that I feel the move system is a bit clunky and could use a few less clicks. In particular I think the player should be able to select a different piece to move just by clicking it, instead of having to close the menu on the current one. A more QOL request I'd have is to be able to see which pieces have pending moves available. All of these are nitpicks. Even if the game wasn't super challenging, I was carried along by how much I enjoyed the concept and I hope you are very proud of it.
P.S. Love the music choices as well. Did you make those?