Mass Effect is a third-person shooter with tactical elements. In the story, you will take the role of the commander of the spaceship. Your mission is to discover the mystery behind the attack on the human colony and to save the galaxy from the danger. 

The game will take you to the distant stars, where you will meet with a mysterious alien race. You will also need to fight against an evil race that wants to destroy the galaxy.

The aliens will be your allies. They will help you discover the truth behind the attack and will fight with you against the enemies.

In order to save the galaxy, you will have to destroy the enemies. You will be able to do this by using your weapons. You will be able to upgrade your weapons and improve their power.

You will be able to upgrade your spaceship to help you fight against the enemies.