This is a fictional game in 2020.
In this game aliens gain the earth & try to float the water sources by vacancy creation & convert It to a giant globe & send it out of earth by its ship.
So you shouldn’t let the enemies to approach those water globes . 
A small group could prevent the earth failure by making a new weapon & installing it on an old fighter.
Just notice that some enemies by creation of an atomic tunnel can destroy you in 30 seconds so you should crush the enemy before the specified time .
The idea to crush the enemy is that by selecting the enemy & changing the color from green to red & shooting 2 to 4 shots , even if its not in your eyesight , you can perish the enemy.
This game has different goals with high graphic & can be an exciting game for your spare time & by crushing the enemy & gaining points you will be able to experience higher levels.
In the last level by crushing the main ship in the space you may be completely victorious.
I hope you enjoy the game & experience thrill!