Extra rule I set for myself: Every movie only counts for one category, that means there will be a bit more than 31 movies on my list.

6 Countries:
-Onibaba (Japan)
-American Gothic (Canada)
-After Death (Italy)
-The Cremator (Czechoslovakia)
-Human Lanterns (Hong Kong)
-Let The Right One In ( Sweden)

8 Decades:
-A Bucket Of Blood (50s)
-Rats: Night Of Terror (80s)
-Hanger (00s)
- I Bought A Vampire Motorcycle (90s)
-The Legend Of The Seven Golden Vampires (70s)
-Absentia (2010s)
-Barbarian (2020s)
-The Body Snatcher (40s)

2 Insect centered Films:
-Squirm
-Mosquito

1 horror film set in space or the future :
-Split Second

2 animated films:
-Monster House
-Wicked City

1 bloodthirsty old person/people film:
-Old people 

2 1970s regional US films :
-I Spit On Your Grave
-Last House on Dead End Street

The worst horror sequel from the 1990s that you haven't seen and can access:
-Hellraiser: Bloodline

1 German Silent Film:
-Faust

5 Films from David Cronenberg, Ti West, Bill Rebane, Charles B. Pierce, William Grefe and/or Joy N. Houck Jr.:
-Crimes Of The Future
-The Innkeepers
-The Town That Dreaded Sundown
-Blood Harvest
-Creature From The Black Lake

2 Christopher Lee films:
-Sleepy Hollow
-Hercules in The Haunted World

1 film with a musician or band in it (A real life musician or band):
-Trick 'R Treat

1 Stephen King adaptation
-In The Tall Grass

1 Lon Chaney film. (NOT JR)
-The Phantom Of The Opera

And 1 Tobe Hooper Film (There must ALWAYS be a Hooper film)
- Spontaneous Combustion