This is a great and creepy game. The variable red to dark light is really effective. Love the material on the character and the sheath on the back. Great touches. The material looks a bit stretched on various areas. You can try a Smart UV Project in Blender to get rid of that or add seams to do a bit more advanced unwrapping.
For the menu screen, you can take a screenshot of the game and use that as the background instead of the current color.
Mannequins are super creepy. Some of the walls could be a bit thicker as they look a bit strange since they're suppose to be rock. Love the robotic female voice. Definitely a great little game.