Quote Originally Posted by ShneekeyTheLost View Post
It would be pretty boring, though...

Overwatch, Overwatch, Overwatch, Overwatch, Overwatch, Overwatch. Turn over

Oh look, the aliens killed themselves trying to close. Hmm... fancy that.

Either that or...

Alien blows away all cover on your perimeter. Now you either have to sacrifice civilians to get behind cover or you die horribly by not being under cover.
A defensive mission would work best if you got to set up your defenses.

Like, you have a building, and some civilians to guard. Before the mission begins, you get to place defenses. Example defenses
Barricades: serve as half-cover.
Floodlights: Provides a penalty to accuracy and defense for characters in it's area of effect.
Mines: Explosions.

If you set up things right, Overwatch Spam would actually be a bad idea. If you can see the aliens already, then it's a better idea to just shoot you. Overwatch Spam is only a good idea if the aliens are going to blindly rush your defenses in order to get to the civvies.

Also, you could have unique "Sapper" type enemies that are going to try to sneak in.

What might be better would be "Evac" Missions. They function like a terror mission, except there are more aliens, and Civvies will take their actions moving towards your evac zone, rather than standing around like idiots until somebody yells at them. You need to balance between holding the Evac zone, and going out to take down aliens killing Civvies out in the field.