[Spoilers everywhere]
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One thing that I really appreciated was the amount of flavor texts: on the one hand, it was interesting to know the behind the scenes of a jewelry store, on the other they were perfect for getting to know Vanessa well... and then being very disappointed to see that ends badly. This is the part that contributed the most to the horror factor: Vanessa doesn't win, the evil thing continues to claim victims and the person you've been with all the time loses. The final cliffhanger and the prologue with the discovery of the evil stone during the archaeological excavations are so classic to make everything appear, in fact, "classic" and not banal. If there hadn't been the reference to streaming services, I would have easily thought of it as a 90s movie!
On the graphic side, I found the pixel avatar very cute. I was a bit perplexed by the fact that mister Cameron and the colleague didn't have a sprite but, thinking about it, maybe the "problem" was that the little girl's father has one: if he didn't have a sprite, it would just be the people who enter in possession of the jewel to have it and the attention would be all on them. I think.
BTW, I hated the first chase because I kept getting stuck in columns. But I guess most of the discomfort was my nonexistent sense of direction.
A nice game that makes you regret reading (I guess) all the flavor texts. Good job!