So, I've had an idea for a novel for a very long time now. It's set in a mythical galaxy filled with dozens of worlds, with a vast history and mythos. I'm still planning it, and I want to make this universe as large and expansive as possible before I write the story. I already have the story mapped out, but I haven't put the metaphorical pen to paper yet. However, there is one aspect of this whole thing which I'm not sure whether it will work or not; all of the characters are aliens. There are no humans. Most of the characters are humanoids, but they're all clearly not human. One thing that has been bothering me is whether this will prevent them from being relatable to the reader or not. So, what do you think?