Unique puzzle game! I think my biggest oversight was underestimating how strong the move-multiple-spaces-at-once power was. Once I started doing that, the chess pieces were no match :)
I think it might be easier to understand if the chess pieces highlighted the entire danger squares rather than just the arrows. The arrows work okay for the rooks and bishops, but it's very noisy when the knights get involved which squares are actually a threat to the player.