This is a relatively straightforward, linear dungeon. However, there’s clearly some sort of secret message in the room layouts. What could it possibly mean?
What is the Secret Message?
This section contains spoilers! Be warned if you read further!
The solution to the secret message is to observe the letters in each room. These correspond to a YouTube URL. Open your favorite browser and enter the following into the address bar without pressing Enter:
https://www.youtube.com/watch?v=
Then type each of the letters you saw based on the order of rooms which should be the following:
dQw4w9WgXcQ
Follow the link and see what happens!