FeverDream | Points

Thank you, this is the movie. I only remembered the ending, so I didn't remember it was Australian.

No, they weren't moviegoers. It was the cast filming the movie that had to fight the killer. There wasn't an influence from the cast or creators or someone that already existed becoming the killer.

It's either a horror or thriller movie where they're filming a slasher movie and then that killer becomes real by leaving the film and coming into the real world and is seemingly invincible. The lead is...