I really like the different realms you put together. The falling snow and the wind audio really made the blizzard area feel cold and isolated. The rain section had a good vibe too, and the cave maze added a totally different kind of tension.
Those eyeball creatures were unsettling. One of them caught me off guard when I turned around and it was just there. The whispers layered into the atmospheric sounds added to that uneasy feeling. I also thought it ran surprisingly well in WebGL for a first-person 3D game. Visually it held up nicely in the browser. Also, the title screen was really cool with the main game art.
The atmosphere and creature design make this game shine. You definitely nailed that eerie, void-stalker energy.