The HAAR is genuinely a great book and I ended up buying the physical copy.

WOOM and At Dark I Become Loathsome are very "what the fuck" while still having an interesting storyline

If you're just looking for something diabolically rancid for sheer shock value, The Slob and The Playground are great

I watch a lot of Pugsr on Youtube, would recommend if you're into these genres (ﾉ*ФωФ)ﾉ