About the attack of aliens

In this game you need a certain amount of time to destroy as many monsters that will move you. Once you start the game, you will see a small ship in the lower part of the game, which you control. If the monsters get to you then you will burn life. When you burn up all of life, then you unfortunately lose in this game and you have to start over. The number of monsters that will move you to a fairly large number presented in the game.