Turret vs Aliens

Features Turret vs Aliens

Army headquarters in secret research facility has been pouring out aliens into the ground.Remove the endless influx of aliens.
You can remove the more aliens to upgrade.
Upgraded
1.
turret gunThe increased rate of fire per second.( I recommend you gather money to upgrade first.
)
2.
HPThe turret will increase stamina.
3.
magazineCan be equipped with more 'special bullet' item.
4.
Special BulletIt gives more damage.
5.
bombingYou can remove all the aliens on the field at once.