Space Shooter: Galaxy Invaders

Greetings Cadet our home has been invaded by aliens from another planet. It is up to you and your skills to defend our people and gain safety for us all.
There are many levels to complete and each is harder than the one before.
During taking off one of your engines blew up. You must give the engineers time to fix it by detaining the invaders away from your ship. Once the engineers are complete you will then have full control of your ship and be able to move it by tilting your phone.
There will be a variety of villains and bosses, each with their own characteristics and abilities.
Our people are counting on you cadet. Restore peace in our home and ward off evil.
May peace be upon you and us all.