This is one of those maps that artificially inflates the playtime by making you take multiple trips between point A and point B. Whenever you reach the end of point A, you press a button that extends the path to point B. Then you go to point B, to press a button that extends the path to point A. Too much needless back and forth.
Other than that, it’s an ok gameplay map. Pretty ugly though, apart from the initial church area.
Link to Nightmare 100% walkthrough: https://youtu.be/dTj32BE3DFs