Maveline

http://www.mangago.zone/read-manga/sweet_home/
I really like this ^

http://www.mangago.zone/read-manga/gorgon/
http://www.mangago.zone/read-manga/bastard_hwang_youngchan/?0m6Z

http://www.mangago.zone/read-manga/the_vault_of_horror_a_collection_of_nightmares/
collection of horror stories, I enjoyed this
~
http://www.mangago.zone/read-manga/pumpkin_night/
and the author's other works, hope you don't mind gore!
~
http://www.mangago.zone/read-manga/jinrou_game/
has two more after that, same premise, the last one has different MC, also lots of gore
~
http://www.mangago.zone/read-manga/prison_lab/
revenge, some gore, sort of a torture game
~
http://www.mangago.zone/read-manga/funouhan/
killing people in both a creative and legal way!
~
http://www.mangago.zone/read-manga/kami_sama_ki_sama_o_koroshitai/?JBPn
LOVE this one, but it seems to be dropped, woth the read anyway
~
http://www.mangago.zone/read-manga/brutal_satsujin_kansatsukan_no_kokuhaku/
Gore! Torture! Gap Moe (?)
~
LISTS for more: (not mine)

http://www.mangago.zone/home/mangalist/722/
made by adderall

http://www.mangago.zone/home/mangalist/8627/
made by Rosa

http://www.mangago.zone/home/mangalist/126439/
Made by Zeno

Thank you very much!!This helped me alot