Abandoned for me is forsaken, ruined, overgrown, destroyed buildings and etc like that. I actually never saw horror in CTMs if someone have a screen of area how looks horrow, pls show.
Horror covers so much ground, which is why I wanted to do it for this Jam - anything from a spooky building, to a spider-infested nest, to monsters creeping from the shadows! Sure, your thing could be abandoned, but abandoned was just a word Krose was suggesting, and beyond the possibility of use as a key word for this Jam, you don't need to pay it any attention.
Just create something spooky! Jumpscares, shadows, scary things!
Beyond brainstorming/taking a few notes, no, as that'd be considered actually working on your map.
I think he might be referring to using pre-existing lore from outside Minecraft, like from some other murder story, and as long as you don't steal something from another map I believe that's fair game but correct me if I'm wrong