This game was a lot of fun!
It was a simple premise, executed very solidly, with a good blend of horror and comedy.
The ending section was genuinely creepy. There are few things that make me nervous more than sitting with my back to an open door, especially with the added context of the story. The monster reveal was good, both in the design and how it was done.
It would be good if there was a bit more to do, maybe with some sort of activity or puzzle solving for resolving some of the calls, or something to do between calls.
Good job!