I had never heard of Ghost Master but I can why you would think they have some similarities.
Yeah the 2 ghosts is so that you can prepare to close the door, and also for the final level with several people to scare. Depending on the RNG, Nancy can either be really easy to deal with or a pain as she stays right by Alfred's side, haha.
We were a bit concerned about the talking/playing ratio, but you know, it's often like this in story-driven games... xD
Anyway thanks for the detailed feedback!