good game
This is a well thought out game. Only a few problems to speak of.
You should be able to tell any squad in range to attack the zombie group, instead of having to use the group the zombies want to attack. It causes so many looses in mission 4 when you start with no vehicles.
The auto-retreat is fine because it helps keep squads alive, but the zombies follow way too closely forcing you to fight another loosing battle.
Your troops move way too slowly. Everytime you lose ground to the zombies, and finally defeat that zombie group, it takes forever to regain the ground.
The squad of 10 soldiers and the mech in mission six is great. It only has one order, Obliterating!
For everyone else, there is no money in the game. The numbers over the vehicles is how many non-combat, unpaused seconds must pass before you get that vehicle. If a squad is forced to fight before the vehicle gets there, you lose the time spent to get the vehicle.
RPG (Rocket Launcher) squads are what you need to use against large groups of zombies. One full strength rifle squad behind the RPG squad is required as well.
If possible, get a vehicle, even just a truck, for every squad.
Some squads start with half or even most of the time required to get a vehicle already used. Try to get a vehicle with each squad, and you will see the time bar in the top left partially full for the vehicle.