I think this came out pretty well... I hope you guys enjoy it. (Sorry, no preloader)
Mouse - Aim and Shoot
Space - reload
there's an in-game help screen and quality and volume can be set in the options menu.
UPGRADES AND WHAT THEY DO
Damage - increases the damage your projectiles do to tanks, helicopters ect.
Fire Rate - Increases the speed at which your gun can shoot
Blast Radius - Increases the explosion size, the larger the explosion, the easier it is to hit soldiers
Max Health - increases the max health of your base
Muzzle Velocity - Your projectiles move faster and farther, but it makes it harder to hit infantry
Max Ammo - the maximum number of bullets your gun can hold
Reload Rate - the speed at which your gun reloads, higher = better
TURRETS AND WHAT THEY'RE GOOD FOR
Minigun - Amazing against infantry, a must have, but terrible against any kind of vehicle.
Rocket - Good against light vehicles like helicopters, decent against infantry
Laser - Obliterates everything, good fire rate, good damage.
PS. Try and ignore the terrible hit testing, I'M WORKING ON IT!