This game has a secret ending I found. Here are the instructions:
1. Interact 22 times with one bookshelf.
2. Find a picture of an executioner on the same level and interact with him using a book.
3. Get a crucifix from an angel by interacting with him 22 times with a lighter.
4. Interact with the very normal machine in the middle of the room on the last level.
This has to be done in incident mode.