I watched this movie on Hulu.
I had heard good things about this film for years, but never got around to watching it. I didn't really know what it was about till I started listening to the SinCast (the podcast for CinemanSins), and them talking about it.
so I gave it a watch, and I loved it!
A very cleaver spoof of horror movies and their tropes, while also celebrating them at the same time and actually being a good horror/slasher film on it's own right. And it did it without feeling at all like Scream. It's funny, it's subversive, and very well written. I've heard some people don't like the ending, and sure there are a couple issues with it, but I loved how it ended. Felt like the perfect ending.
To give a summery of this movie would ruin some of the surprise, and I would advice going into this movie blind.
Mistake Status: N/A.
★★★★★
Quantom X ★
Answer: As you said, it is a satire of the common Deus Ex Machina trope you find in such films.