I'm a big fan of the theme of the mission; I do love an asymmetrical attacker/defender mission, especially one where the objective is running away from an overwhelming force.
I do have a concern regarding the mechanics: if the game only last 4 rounds, 30" is a long way to go and (barring some coherency schenanigans), would mean that if a unit carrying an objective is delayed for even a single round doing anything other than running for the endzone, they won't be able to evacuate, as it would take 1 round to pick up the marker, then 3 rounds to cover the 30" distance.
Also, the battlefield map shows Zone B on the West edge of the board, rather than the East. Pretty minor, just had me confused for a bit.