Got around to viewing this.
Couple of things to consider.Notice how the elevator was like Jacobs ladder or the Ladder of Lights, the Kundalini in a way. Notice at the end, the beastly natured people were still holding hands. The world consist of more people who live in their root chakra and most support each other in continuing to live that way.
They wear those penitentiary suits because they’ve been held a prisoners to the ego so they became beast like, that’s why they grunt and barely talk.
Hypothetically speaking, if a part 2 is made (doubt it), the family that survived at the end would have to defend themselves from those people like they did against the other family. Those rabbits represents the innocence and inner child within each person.
The doppelgängers matured with their other half which had matured but when that inner child is silenced or overthrown by the developing ego, it mutates and comes back for you because most toss their personal issues in the dark and never address the issue, the boogie man, that’s why the maze name was “Find Yourself”. It’s just like a parent not being there for their child when they’re young and the child grows up somewhat fractured. Society passively programs people to be this way in locking their problems away because this society is so fast paced. Most people are scared to look within their depths (subconscious) because this illusion keeps blanketing the true issues.