Labyrinth?

You wake up in a dark labyrinth, full of narrow corridors and endless turns. You are not alone. Something sinister lurks in the darkness. The monster always knows where you are. It senses your fear, hears your footsteps and pursues you relentlessly, like the embodiment of darkness itself.

With each approach, reality begins to fade. Your screen darkens, as if your mind is gradually plunging into darkness. You lose touch with reality, and the closer this creature gets, the more your mind trembles on the brink of madness. When the darkness swallows everything - you lose.

GitHub - source code