I guess I can consider this one a jumpscare animation.
The antagonist in this is surprisingly NOT the monster made out of mold, it’s actually the box (or Rubix Cube) on the monsters face. To defeat it, you gotta solve it, like a Rubix Cube.
In the story it’s referred to as Der Wurfel.
Song:
Laura - twill.beats
Silent Hill (this is a remix)