I've never heard the term "deep web" horror game, so forgive me if I miss the mark with these suggestions. I've played Psychopomp and know what Sad Satan's deal is, so I'll try to recommend similar. Seems you want games that play like classic Windows screensavers. Antiquated graphics, an affinity for the surreal, and emphasis on exploration over gameplay.
>Disillusion ST
Probably my favorite among the weird subset of exploration games that I've played. S+++ rank for aesthetics.
>Electric Highways
Not a horror game but has you exploring a polygonal world. Ostensibly a puzzle game but it's just about absorbing sights and sounds. Described on the download page as an "interactive conceptual music album."
>BABBDI
>Fractal Sailor
A "horror tech demo." Sail a rusty old ship through a dizzying fractal environment. Available as a demo.
>Lorn's Lure
Contrasting with the rest of the list, this one's a platformer. Unlike other entries in this list, skill is required. Speedrunner appeal. Right now it's just a demo.
>LSD: REVAMPED
Remake of the classic LSD: Dream Emulator for PS1. The original was probably the earliest or at least most influential example of this sort of game.
These are all free. As all the best things are : )

>>900
GOD BLESS YOU (or whatever you believe) Thank you so much man! :D funny thing is I only have like one game which is DISILLUSION TOO ahaha, you got what I was trying to say and thanks for that :) how do you think I can describe it next time?

>>901
Happy I could help! These sorts of games are my favorites but it's hard to share them since they're a little out there.
The terms I see come up are exploration game or maybe something like first person dungeon crawler. Walking simulator? Throw "retro style" or even "vaporwave aesthetic" in there and folks should get the gist. Listing a few games like you did is probably the best way to go. I guess it's more of a vibe than a genre which makes things tricky to name without making a word salad.

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>>902
Imagine a game like that where you're in the UNIVERSE and gotta fight GODS or something like this ahha would be cool, you dont happen to know any such games, do you bud?

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>>904
I do not, but that does sound pretty cool

>>904
There's a batshit insane game called Cruelty Squad that fit that discription well in my opinion.