I don't think it will work. People need somebody they can identify with. They need a hero, a person of their own species. People don't want to help freaky alien destroying the planet they live on and killing their own species. Have you ever thought about why the typical Hero - Antagonist(s) scheme is repeated over and over again? Because it works. You totally miss the psychological aspect. Only great graphics won't do it.
You may let win the aliens, but you need a hero. Give the people
a charismatical hero, with a mission worth to die for and a global scale (e. g. global resistance otlt.)
