I really liked the game and think it deserves 5 Stars. However, there are some things that should be improved:
- Different background (It was cool because there was rain and night but the background should change sometimes)
- Shooting range (Just like HibiscusMallow said, a shooting range to test weapons and explosives would be very cool.
- Improved search party (I think that every 3-5 waves one of my search party guys died)
- Upgrades (Ability to upgrade the weapons fire rate, damage, accuracy, etc)