You shouldn't be worried about that! 
Like, there's been vampires from space, clowns from space, whatever. Demons from space shouldn't be any different. Hell, I've had a few ideas about that myself.
As long as you're telling the story your way and doing things for your story, it really shouldn't matter what some people will say it looks similar too. Honestly, those people will compare and complain about anything. There's just no pleasing those types XD