Cinemonster's Original List

6 countries
Sweden - Let the Right One In (2008)
Japan - Pulse (2001)
Austria - Angst (1983)
France - Raw (2016)
South Korea - The Host (2006)
USA - Mimic (1997)

8 decades
1950s - Creature from the Black Lagoon (1954)
1960s - Hour of the Wolf (1968)
1970s - The Town That Dreaded Sundown (1976)
1980s - The Fog (1980)
1990s - The Craft (1996)
2000s - Pulse (2001)
2010s - The Love Witch (2016)
2020s - The Empty Man (2020)

2 insect centered films
Phenomena (1985)
Mimic (1997)

1 horror film set in space or the future (relative to when it was released)
Event Horizon (1997)

2 animated films
Wicked City (1987)
Mad God (2021)

1 bloodthirsty old person/people film
X (2022)

2 1970s regional US films
The Town That Dreaded Sundown (1976)
Alice, Sweet Alice (1976)

The worst horror sequel from the 1990s that you haven't seen and can access.
From Dusk Till Dawn 2: Texas Blood Money (1999)

1 German Silent
The Cabinet of Dr. Caligari (1920)

5 Films from David Cronenberg, Ti West, Bill Rebane, Charles B. Pierce, William Grefe and/or Joy N. Houck Jr.
Crimes of the Future (2022)
The House of the Devil (2009)
X (2022)
The Legend of Boggy Creek (1972)
Blood Harvest (1987)

2 Christopher Lee films
Horror Express (1972)
The Wicker Man (1973)

1 film with a musician or band in it (A real life musician or band)
Trick or Treat (1986)

1 Stephen King adaptation that is not the first go around.
Pet Sematary (2019)

1 Lon Chaney film. (NOT JR)
The Unknown (1927)

And 1 Tobe Hooper Film (There must ALWAYS be a Hooper film)
Lifeforce (1985)

I haven't really found the time to devote to these types of challenge lists this year the way I would normally like to, but Hooptober is too good to pass up so hopefully a bit of a head start will make things more manageable.