Gone to Ruin

Echo Omega has always lived among the stars in a small spaceship with her sister. She knows that they're the last humans, but every other detail is blurry- who built the ship, what happened to the other humans, and how Echo herself got so many strange powers. And as the last humans, they should be, like, making contact with the alien species that they know about or something? When they crash-land on a planet, cue making friends, making enemies, and making history! But it's not all fun and games when Echo learns the truth about herself and the extinction of the human race.