By the end, only Dana and Marty are left. They make their way down to the underground control room and let loose all the horror movie monsters meant as potential killers for them. The creatures kill all the workers. The Director of the whole operation tells Dana and Marty that the whole thing was a staged ritual to sacrifice people to the gods that ruled the Earth years ago and now reside underground. If the gods don't recieve a proper sacrifice, they rise and destroy the world. Dana considers killing Marty to save the world, but she is attacked by a werewolf. Marty fights the Director, who gets killed by a zombie. Bloody and battered, Dana and Marty share a joint as the gods rise to destroy the world.
Plot hole: When Dana realizes that the puppeteers made them choose their own deaths (while standing in front of Fornicus in the elevator) she does so by watching the puzzle ball he holds. But she never saw the puzzle ball back in the cellar. Only Curt handled it briefly and is shown approaching her without it when she starts reading the diary.
Trivia: The movie pays tribute to many famous horror movie monsters. The creature with the Buzz-Saws in its head with the Puzzle Orb is based off PinHead. Once it's free, you can see a Chatterbox-influenced cenobyte standing next to it. The people with ceramic masks who tie up and torture the scientists are based off The Strangers. The psychotic clown with the knife can either be seen as a tribute to PennyWise or Killer Clowns from Other Space. The massive killer bat is obviously from the movie BATS. A chainsaw can be heard as the different monitors are showing the slaughter - indicating LeatherFace. The ghoul-doctors operating on a victim while staring into the camera is based off House on Haunted Hill. The Red-Neck zombies brought to life through an incantation from a book is a tribute from The Evil Dead. The Scare-Crow-like zombies who kill the black security guard are based off of the movie ScareCrow.
Question: Is there a reason, that a facility full of monsters would ever, under any circumstances have a System Purge button? Is it just to make satire of the fact that the antagonist is usually stupid?
Answer:As you said, it is a satire of the common Deus Ex Machina trope you find in such films.
Answer: As you said, it is a satire of the common Deus Ex Machina trope you find in such films.