A quite enjoyable experience - carefully picking where and when to dip out of the light and navigating between objectives is a solid core loop. Adding occasional physical wandering monsters and chase scenes works well, thanks to the solid movement implementation. The bits of story are enjoyable too.
It would be great if you mentioned the inventory key somewhere, though, given how important it is. I also noticed that the stability flask is only healing 10 sanity, not 15, and I think the 'Defend' options aren't quite balanced - I did some Monte Carlo combat simulations and they appear to all be strictly worse on average than just repeatedly attempting to escape.
Here's my playthrough: