Spooky and definitely made my skin crawl on a few occasions!
The movement of the spider and the sounds it makes when it’s near is spot on. I think if you wanted to ramp up the horror, you could focus more on the amount of sounds you can hear in the mine, and how aggressive the spider is. Some ambient sound of it running in the distance or it hitting things over for example; Making use of how sound would travel/echo down there. After the initial creepiness it’s pretty easy to get rid of the spider and get out of line of sight. Maybe some objects makes sounds and summons the spider, it can see you from further away and chases you for longer (with more sprint that 4-5 seconds). That along with maybe 1-2 extra jump scares (webbed up body falling for example) will really help the creepiness factor!
A few bugs (or arachnids) though. Mainly with the world turning into a void in chapter 3 and the cutscene freezing up, but changing the frame rate to v-sync and quality to low did fix the first one.
Overall good stuff, here’s hoping the next game is even creepier!