Only 2 maps in the 28-chapter game are entirely "flat, empty squares," and the first one is the only chapter in the game you need to escape with everyone. You're in the middle, and the entirety of the left and right side have escape tiles. It's not a great map, but it's not horrible. I'd say the quality of the maps are overall average. Birthright quality, maybe?
fake edit: Technically 3 maps are, but the one I just remembered makes sense since it's one of those "we're going to copy your army" chapters. You can't make a map based on completely random enemy set-ups.