Anybody having trouble with companions dying and not being able to revive them, you need to choose "save and quit" on the menu (DON'T leave the room first), and then when you continue your game they will be revived again.
One way to beat really tough levels: kill all the first wave except one archer; then send out only your peasant to repair the wall. He should repair it slightly faster than the archer damages it; after that, go make yourself a cup of coffee while the timer runs out. (Except check back every now and then in case the repairs were finished and the peasant went back in again!)
As an aside, the shield isn't very useful because while it reduces the damage you take, it also reduces the speed you repair at, so the net effect is minimal.
Tips for hard badge: Don't get any weapons except the pistol, shotgun, and chainsaw. Concentrate on building defences to take care of the infantry: a few gunmen to start with, then get a flamethrower when you can afford it. It will take care of the men and you can focus on the jeeps and hoverpacks with your shotgun and then later chainsaw. Don't hold down the chainsaw, just click briefly, otherwise you use too much ammo. Once you have the flamethrower, start getting more gunmen and then a laser. Don't upgrade the laser damage yet, only speed. Once you have enough gunmen to hold off all the infantry (maybe 40 or so) sell the flamethrower so by the end you can get three lasers. Don't upgrade the laser damage until you start getting tanks attack you; let the lasers take out the hovermen and use the chainsaw on the terminators on the ground. Eventually you should have three full upgraded lasers, 15-20 repairmen and 80-100 gunmen. :D
The outfits and jewelry are kind of hard to click on sometimes. There's a nice selection of them, though. All it needs is critics at the end telling you how nice it looks. (Or how terrible, if you're feeling nasty.)
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 "Kingdom of The Wind"){kind=icon}
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 "The Great Siege"){kind=icon}
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LOLOL yes!!! Genius idea