!!!SPOILERS!!!
So, let me get this straight:
- The Snipper's first four murders happened some time ago and the police have already removed all the body parts from the scene, however, you can still find fresh limbs of multiple people scattered all over the place, which means that the cardboard cutouts are from his previous victims and weren't collected as evidence by the police, but the fresh limbs belonged to the recent ones, implying that he's killed at least 2-3 more people shortly before Adam and Kevin break in
- All the items you use throughout the game were left there by the Snipper in a specific order, with the express purpose of giving you a chance to escape
- He's a cannibal, as evidenced by the words "saddy meal" written near the kitchen that contains someone's viscera and limbs and a hacksaw
- He hangs Kevin's body in front of a shutter that the police approach as a way to taunt both the police and Adam, or to potentially frame Adam as the murderer...
To top it all off, his voice sounds demonic and distorted, as if he's not even human. It's just a speculation, considering it could've just been aesthetically motivated, i. e. to make him more intimidating and the overall experience more surreal. What does he say, anyway? I could only recognize bits and snippets, but from what I could distinguish, he mentions making Adam into a "friend" and something along the lines of "There's no place to hide!".