I am writing a murder mystery set on a distant planet inhabited by vampire-zombies. I am not sure what genre this would fit into?
(I feel like I'm missing something, but I'm going to give my honest answer anyway..) The options you provided a completely different than what you're describing. Romance is a genre. Mystery, fantasy, and sci-fi are also genres. Young adult is a target group, not a genre. There's young adult romance, young adult thriller, young adult paranormal, young adult fantasy, and more. I'd say fantasy based on vampire-zombies. Young adult, new adult, or adult would depend on how old your MC is or who you want to read your book.
