I'm in need of some horror flicks other than Junji Itou's works
I don't mind the bloody, gory stuff but I prefer psychological, mystery genre.
I don't want to read something too long. One shot or episodic manga is much more welcomed.
I also prefer unconventional art style over generic cutie style such as Another.

And finally, I would like to read something that make me feel scared or at least creeped out, though I don't mind some black humor.
Tldr; I mean "horror" should be the primary genre of the manga so don't recommend me stuff like Shiki, Tokyo Ghoul, etc.

Thanks in advance.

if you want to be creeped out, then you should definitely try I am a Hero if you haven't read it already. Also, Apocalypse no toride

Some with creepy art:
Gyo
Drifting Classroom
Fourteen

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Fuan no Tane. It's somewhat long, but the chapters are all 5 pages or less.
It's mostly jump scares, but it's definitely creepy!

Maybe Chiller.

And here's a semi-helpful similar thread;
https://www.mangaupdates.com/showtopic.php?tid=18843

Ibitsu. Dokuhime.
More psychological, some of my favorites. Ibitsu still has plenty of gore though, and Dokuhime has more plot than just horror so neither are probably quite what you're looking for, but I'm not usually a fan of horror and I absolutely loved these. 🙂

"Everything is okay in the end. If it's not ok, then it's not the end."

"I'm tired of all the nonsense about beauty being only skin-deep. That's deep enough. What else do you want; an adorable pancreas?" - Jean Kerr

When I said 'death' before 'dishonor', I meant alphabetically.

Imagine what would happen if there were no more hypothetical situations.

Quote from Morrelan

And here's a semi-helpful similar thread;
https://www.mangaupdates.com/showtopic.php?tid=18843

That thread is very helpful. Thanks.