Love it! I get a serious sense of twisted fear and the music evoking imagery of undead creatures that aren’t necessarily visible but are nonetheless scary, executed in a serious way. Also getting some serious Twilight Princess and Majora’s Mask vibes, like if Ben drowned and woke up in the twilight realm.
This is all what was going through my mind even before reading the premise in your description.
After reading your premise, It occurred to me just how eerie it was to read during a time when wildfire-induced smoke had just covered my hometown and made it very difficult and unhealthy to breathe for more than a few minutes over a three-day period.
Overall, really good music presentation. It fit really well with the imagery your description presented. Feels creepy as hell and it’s clear you were able to evoke a lot with a little here. :)