I actually frightened (that is quite rare in Duke3D) when the first ghost appeared.
Have you played my older map
Rural Nightmare ? This is where he got the effect from, and it made a lot of people jump on their chair back then as well
speaking of which, I just played the map, and I think it has the same flaw as my own Rural Nightmare - it's moody and interesting (I liked that), but the gameplay itself is a bit dull, because you basically made four corridors (that reminded of Scooby Doo haha), filled them with sounds and there is a room with five enemies at the end (and you don't even get the innovation points). It's a shame, because with these new textures and these sounds, you could probably have made a much more epic, ambitious, longer level if you had put in more effort, at least into the layout. Basically building and releasing it like that made for a waste of potential in my opinion
Your mapping is improving nonetheless, and now at least your work is worth being checked out. If I had two tips to give you though : spend more time on your levels because quality is better than quantity (number of releases) ; and I see you've been experimenting with a lot of people's ideas and styles recently, it's good to start off as a form of practice, but you should consider trying to think up your own original features at some point, you're probably not quite there yet, but when you will be you will realize that it feels so much more rewarding.