UFO Repulsion for Android – Latest Version & Features

At one point in time, a city comprised of five houses existed peacefully.
But one day, spaceships began falling from the sky above them.
Realizing that their housed could not take much punishment from the falling debris, the citizens created a massive turret to protect them.
However, because of the villagers inexperience, the missiles did not destroy the UFOs.
Instead, the spaceships were knocked off course and away from the city.UFOs continue falling to this day, and citizens continue shooting dud missiles at them.
How long can they last?----No sound, no menu screen, no high score tables.
Any suggestions (especially regarding game balance) would be appreciated.
This is my first game on the Play Store.The Errorcode -2 was magically resolved.