I feel like I should verify my recommendations, as some are admittedly films I like but some may not.
-Vampyros Lesbos is from a director I usually find boring, and it may bore those looking for a more "traditional" genre film. That being said, if you want an off kilter, sexually charged exploitation film with a great soundtrack, then you may or may not want to dig in.
-The Slayer (in no way related to the poster) tends to get a mixed reaction when it comes to slasher movies (most of the performances are pretty bad) but I dig the slow burn nature of it-and man oh man the kills are nasty.
-The Dead Pit is admittedly a guilty pleasure, as it isn't particularly well made or acted (the acting in particular is abysmal). Nonetheless, if you like your horror cheesy and gory, you may (or may not) enjoy this.
Oh, and a few more recommendations
-Ringu (1998) directed by Hideo Nakata (Ghosts and Haunted Houses)
-I Walked With a Zombie (1943) directed by Jacques Toueneur) (Zombies) granted, this is pre Romero, so...
-Bone Tomahawk (2015) directed by S. Craig Zahler (Mutated People and Shapeshifters)
-What Have They Done to Solange (1972) directed by Massimo Dallamano (Psychological Thrillers)
-Fade To Black (1980) directed by Vernon Zimmerman (Killer Stalkers aka "Slashers")
-Absurd (1981) directed by Joe D'Amato (Killer Stalkers aka "Slashers") I'd hesitate to call it good, but man oh man is it gory
-Next of Kin (1982) directed by Tony Williams (Ghosts and Haunted Houses)
-Night of the Werewolf (1981) directed by Paul Naschy (Werewolves)
-A Lizard in Woman's Skin (1971) directed by Lucio Fulci (Psychological Thrillers)
-Magic (1978) Directed by Richard Attenborough (Killer Dolls)