This is quite impressive! A very complete experience with a high degree of polish, especially for a jam entry. There are a lot of small touches here that show attention to detail. (Like the tutorial popups or the ability to deactivate some of the visual effects.) Using the harsh and somewhat disorienting environment as a source of horror was a good idea, and it's executed very well here. And then there's a scary monster on top of that! I did get lost rather easily, but that might be a problem on my end, hah.
All in all, a pretty impressive entry. Thanks for including a Linux build as well.