I can make the FOG color definable by the user in the menu,
I somehow like a brown Fog more,
but Black is the classical way.

The voices could be switched to "simple" voices in the menu,
so that the units only say somehing like "ok", "yes" (if they annoy too much)
I dont really have professional speaker for them,
so I used some selfmade ones and some from a voicegenerator.

With more airunits, the Turrets will make more sense.

I think the bunker concept makes more sense, than an automatic
defense-turret for groundunits,
This makes the player decide to use the units in the bunker as defense
or move them to the enemy.
The bunkers can also save the scavangers during an attack.