This game had a lot of suspense, and I personally really like this style of graphics, it adds to the creep factor. This game also ran very smoothly for a webgl! Nice work.
While I think you had good intentions with that really long stretch of walking, I personally feel like it was overdone a bit and lost its suspense after a bit. Following the blood trail went on too long and began to feel more like a chore. The flare was a nice break from that. But I think if you had added more, perhaps the sound of snow crunching/footsteps behind you halfway through, or perhaps had some trees with shifty shadows, the player could have stayed a lot more engaged and worried for longer while walking. Though I understand the limits a game jam poses, so those could perhaps be things to think of after the voting.
The aim of the gun was also not exact, my flares kept shooting down and to the right, but I was able to get the hang of it and didnt hinder the gameplay too much. It would've been nice to have some sort of indication that I was actually hitting the enemy, as I was unsure if I'd even hit most of my shots because that too went on a while. But I felt genuine fear and suspense while inside the facility and was met with surprise and disgust (in a good way!) when seeing those gruesome "surprises" you had added.
This game had a really great ambiance to it. Well done creator/s, I would love to see a more fully fledged out version of this game at some point in the future! It was a very intriguing and captivating idea.
Edit: I apologize for it posting my review 3x :') My internet is not the greatest.