Hello! I'm just starting on reading gore and psychological manga and I am very interested in it lately, If you have some recommendations please do say
HORROR // PSYCHOLOGICAL
> Brutal: Satsujin Kansatsukan no Kokuhaku
http://www.mangago.me/read-manga/brutal_satsujin_kansatsukan_no_kokuhaku/
> Pumpkin Night
http://www.mangago.me/read-manga/pumpkin_night/
> Kichikujima
http://www.mangago.me/read-manga/kichikujima/
> Prison Lab
http://www.mangago.me/read-manga/prison_lab/
> Tomogui Kyoushitsu
http://www.mangago.me/read-manga/tomogui_kyoushitsu/
> Fukushuu Kyoushitsu
http://www.mangago.me/read-manga/fukushuu_kyoushitsu/
> feeding lamb
http://www.mangago.me/read-manga/feeding_lamb/
> Kami-sama, Ki-sama O Koroshitai.
http://www.mangago.me/read-manga/kami_sama_ki_sama_o_koroshitai/?83z4
> Jinrou Game
http://www.mangago.me/read-manga/jinrou_game/
> Jinrou Game - Beast Side
http://www.mangago.me/read-manga/jinrou_game_beast_side/
> Jinrou Game: Crazy Fox
http://www.mangago.me/read-manga/jinrou_game_crazy_fox/
> Funouhan
http://www.mangago.me/read-manga/funouhan/
> Tenkuu Shinpan
http://www.mangago.me/read-manga/tenkuu_shinpan/
> MADK
http://www.mangago.me/read-manga/madk/
> Homunculus
http://www.mangago.me/read-manga/homunculus/
> U12 (Under 12)
http://www.mangago.me/read-manga/u12_under_12/
> Apocalypse no toride
http://www.mangago.me/read-manga/apocalypse_no_toride/
> Save me
http://www.mangago.me/read-manga/save_me/?yZNC
> Uncomfortable Truth
http://www.mangago.me/read-manga/an_uncomfortable_truth/?F8kz
> PigPen
http://www.mangago.me/read-manga/pigpen/
> miss guillotine
http://www.mangago.me/read-manga/miss_guillotine/?YJEb
> Sweet Home
http://www.mangago.me/read-manga/sweet_home/
> Bastard
http://www.mangago.me/read-manga/bastard_hwang_youngchan/?MMYm
HOPE THIS HELPED

It has a main character which was weak at first and gradually became op. There was this girl as well that he fights along with and they were stuck in this school fighting off the hoard. After the school, they eventually started to expand destinations and met their villain, a bald headed zombie guy that can command zombies and is extremely intelligent