As far as I can tell, this is already planned. They are actively adding story areas/enemies/PDA's. And I think there is an actual option of 'Story Mode' that will be added at some point. (View Post)
My first encounter with Reapers... I was swimming around the Aurora. Because of course I had to. I wanted to see the space ship. So I saw this reaper, all big and scary. And yeah I was scared... so I… (View Post)
