OH YOU GOT ME!
I'm writing this one after my first playthrough, getting ending 3.
This was really simple. Also- one of the best games (from what I've played so far) in this jam. Tension building was spot on- I was looking at the mannequins hard, trying to spot if any moved. And the amazing "oh shit" moment once the walkie calls again.
You did really great job with limited scope. Awesome work!