This mission requires a lot of very specific terrain, which is going to make it hard for many people to play. Also, if I'm reading it right, you can place a wall after every activation? That means you could place 6 at the start plus up to another 10 during the first round alone. And you place them so fast that you can basically make a full wall from top to bottom, and just replace a broken section every time an enemy charges into one, as they can't activate more than 1 unit in between times you can restore a wall.
Also I think there's a row missing in your VP table - or you need to explain what happens when a seed isn't captured at all. Round 4 says it's 8 to the defender and 0 to the attacker. If it's the same for not capturing it, then there's basically no reason for the attacker to even try in the last round, they're better off trying to kill defenders. (Assuming they can get through the wall, which I don't think they can)