By equipping the base on someone else's planet, do not expect that you will be friendly and start to help develop. On the contrary, locals are likely to perceive the appearance of foreigners hostile and this at best. And at worst, what happened in the game Age of Invaders - an attack. You did not have time to properly equip and strengthen the defensive tower, and the indigenous inhabitants of the planet launched an attack. We will have to repulse the attack and simultaneously modernize the tower and the laser cannon. Try to destroy the flying enemy until he is above the object. When the green bombs are dropped, you will only have to lick your wounds.