Anus

looks like the art style from just kidding, not sure tho.

Sorry, I can’t be certain since I haven’t read it, but a Google image search revealed its possibly from this;
https://www.mangago.me/read-manga/a_strange_joke/

https://www.mangago.me/read-manga/killing_morph/

https://www.mangago.me/read-manga/hide_and_seek_on_the_sofa/

If you squint, maybe these would work?

Apocalypse/Survival:
https://www.mangago.me/read-manga/shokuryou_jinrui/
https://www.mangago.me/read-manga/apocalypse_no_toride/
https://www.mangago.me/read-manga/happening/
https://www.mangago.me/read-manga/distant_sky/
https://www.mangago.me/read-manga/cool_age/
Killing Game:
https://www.mangago.me/read-manga/prison_lab/
https://www.mangago.me/read-manga/tenkuu_shinpan/
https://www.mangago.me/read-manga/kamisama_no_iutoori_ii/
https://www.mangago.me/read-manga/jinrou_game/ (the whole series - Jinrou Game, Beast Side & Crazy Fox)
https://www.mangago.me/read-manga/signal_100/
https://www.mangago.me/read-manga/ikenie_touhyou/
Revenge:
https://www.mangago.me/read-manga/misu_misou/
https://www.mangago.me/read-manga/the_hero_who_seeks_revenge_shall_exterminate_with_darkness/
https://www.mangago.me/read-manga/juujika_no_rokunin/
https://www.mangago.me/read-manga/maria_no_danzai/
https://www.mangago.me/read-manga/brutal_satsujin_kansatsukan_no_kokuhaku/

https://www.mangago.me/read-manga/pumpkin_night/

Is also good if the person above hasn't listed it already

I’m kinda in love with you

I also just stalked you and probably saved myself hours of searching out good reads. I hope you get everything you want in life and more

lol, you're good. I tried to pick more mainstream horror with a lot or a decent amount of gore (since I'm a huge horror fan myself). If you're into other kinds of horror content with less blood that lean more into the psychological/thriller aspect, I have some recs too. Though they can't really be lumped into generalized groups like revenge or killing games but still are pretty good in my humble opinion.

Pls drop all your recommendations _/_