Looking

Parasyte.

Tomodachi game

i'm not really that much of a fan of psychological so i've only read a few, but i surprisingly really liked them:

Death Note- http://www.mangago.me/read-manga/death_note/
(though you might have read this already)

Paranoia agent ( its an anime but its hella good)

Beastars - http://www.mangago.me/read-manga/beastars/
(if it counts ?????)

Pigpen - http://www.mangago.me/read-manga/pigpen/
( only a few chaps have been uploaded here and read by me but its seems good so far)
and anything else made by Kim Kanbi like,
http://www.mangago.me/read-manga/bastard_hwang_youngchan/
http://www.mangago.me/read-manga/sweet_home/

hope this helps, even if its just a bit ヾ(❀╹◡╹)ﾉ~

Thanks guys for the suggestions. I have already read most of them though and if you have any underrated or just more recommendations in general please add more!