Needs "restart" button. Bug placed character at top of map after being crushed by falling door. Fell endlessly into oblivion after jumping off the "edge".
Killer- Focus on damage and rate of fire upgrades. Don't upgrade hp or speed. Make sure to always be firing the gun, even when units are not on the screen. Shoot where they will be, not where they are.
Easiest way to get the hard mode badge is to max out your ultragun. Do some intermittent drone upgrades. After you get your drones and ultra gun cover, alternate between putting up more fighters and laser turrets.
Do not use rockets. Ever.
You guys do realize that the more medals you earn, the more bonuses you get per game right?
Just keep trying as different things. and don't just recruit anyone from the barracks, make sure its the person that has good potential, not the 'average joe'.
Also, upgrade the weapons the AI uses every now and then. I got to lvl 30 and realized one of them was using a crap HMG.