One Man Invasion

An enemy spaceship with hostile green aliens landed on the planet Earth . You are part of a combat unit and your task is to get rid of these monsters from our planet. This game has a total of 21 levels, which difficulty rises. You always have a limited number of shots to get stars for completing the level. Can you gain3 stars in every level and total 63 stars? Sometimes the only way how to kill an alien is that you will need to correctly bounce the bullet from the pole.. Save the Earth and get rid of all the aliens. Have fun.