Vade Retro smartly boils the exorcism genre down to its fundamentals. The main conflict between exorcist and malevolent force doesn't require any extraneous tools like dice or cards to determine success, simply the wills and words of the players. I feel like this system faithfully recreates the drama and push and pull we expect to see in exorcism media.
This games short section on religion is also very interesting and I think can be applied to a variety of games that feature religion as a theme.
This game does require a group that trusts each other and values creativity and the greater game above personal victory to really shine. That being said I think most games works better with that expectation.
If you want to finish October off with a Bang, download Vade Retro.