I'm watching 1 horror movie per day to celebrate Spooktober, does Se7en (1995) count?

My dad argues that it's not quite horror but it would fit my Spooktober. I'm not entirely sure if I should watch it or just watch something more "horror/halloweeny" instead. So far I've seen Scream (1996) and I Know What You Did Last Summer (1997). The rest of my list goes like this:

• The Exorcist (1973)
• The Grudge (2004)
• The Ring (2002)
• Saw (2004)
• House Of Wax (2005)
• The Texas Chainsaw Massacre (1974)
• Jaws (1975)
• Alien (1979)
• The Thing (1982)
• Donnie Darko (2001)
• The Blair Witch Project (1999)
• Silent Hill (2006)
• Final Destination (2000)
• Shutter (2008)
• The Evil Dead (1981)
• Paranormal Activity (2007)
• Child's Play (1988)
• It (1990)
• Slither (2006)
• Poltergeist (1982)
• either Carrie (1976) or The Haunting (1999)
• Pearl (2022)
• The Silence of the Lambs (1991)
• Friday the 13th (1980)
• 28 Days Later (2002)
• The Shining (1980)
• Nightmare on Elm Street (1984)
• Halloween (1978)

I might give up on Se7en and watch both Carrie and The Haunting. Am I forgetting any classics?