The objective of the game is to survive for 11 days to recieve reinforcements. You can employ additional gunners or workers to help you hold off the indian assault.
A tip would be to shoot as soon as you see one so they cant come close. Employ gunners to help you down some indians and workers to keep your defenses up. Good Luck!
Move Left / Right / Crouch: A, S, D Keys | Aim and Shoot: Use Mouse | Change Guns: 1, 2 Keys | Reload: R Key