The mystery of the abandoned shelter

On the outskirts of a small town, there is a dark forest, and deep in the forest, there is an abandoned shelter. The locals tell stories that many years ago, the director of this shelter traded children's souls for his immortality. And then, in just one night, the shelter suddenly became deserted. "Nonsense tales," you decided and went to investigate this place from the scary stories. And now you are here, in the empty abandoned building. It's time to return, but it seems that something or someone won't let you just leave.