This adventure was a decent crawl. I did add a complex trap to fluff out the adventure and provide more of a challenge, which my players thoroughly enjoyed. I ran the entire adventure in initiative order with a drawn map so that it would be easier to track where the characters were when the doors opened. My players were on their toes the entire time and at several points got separated from each other. My biggest complaint is that the scaling makes this a deadly module for low level characters. As a DM, you need to be prepared to add encounters to the empty rooms so that the module takes the prescribed length of time.