Speculative fiction is a growing category these days. It’s a rising trend (though really, it’s applicable to all fiction) to push the envelope and see what you can get away with. The constant question asked by amateur writers is “How far is too far?”
How far can you push the readers into uncomfortable territory before they balk and walk away? How far can you take an idea before it splits at the seams? How far can you diverge from the natural laws of the universe or the norms that we are used to and still make sense?
What many new writers do not realize is there is no such thing as “too far.” While it’s true that some decisions you make will scare some readers off or at least anger some people, it’s not true that you should let that dissuade you from writing something. You cannot please everyone.
As long as you write strongly enough, you create characters with enough depth, you create your own laws for how things work and you stick to those laws, you focus on little details to flesh things out, you can get away with anything! You don’t have to stick to reality. Because the beautiful thing is, this is fiction.
Who says cars can’t fly? Physics? Sure, but our physics are based on theories that are only our interpretation of phenomenon around us. Science is asking to be proven wrong, and some day it might. Who says people don’t have two heads? Biology? Well, that’s just from what we’ve seen. There could be thousands more species out there.
The point is, you shouldn’t let anyone tell you that you’re going too far into unknown and unexplored territory. As long as you spend the time developing the ideas in your head, as long as they are real to you and you know every minute detail of how things work, then you shouldn’t have any troubles going off the beaten track. It’s fiction; everything really worth writing, at its core, has already been written. What makes stories unique, what makes it possible for new stories to still be put out and published, is the unique combination of elements, words, and characters. If you just rehash something from someone else without adding in that new flair, that venture into uncharted territory, than you’ll have a bland story that no one will read.
You can’t go too far in fiction. But you can go not far enough.