This list was cobbled together from about a half dozen different variants of that "depth of gaming obscurity" icebergs image, along with several similar icebergs, lists, and recommendation charts for weird/obscure/surreal games.

Feel free to recommend additions, especially for the lower end of the list, preferably with a rough idea of where it would fall in terms of the "tiers."

The Kid/The Gamer/The Weird Guy/The Outcast/The Hardcore/The Alien/The Pioneer
....

Not currently on Backloggd:

3D Virtual Creature Evolution
ASCII Zanmai
Botulism
Dangaville 1998
Deepmatrix
Dyna Star
FLATLAND ROVER
Gallery of Dreams
Gates Of Ivory: A Descent Into Madness
I'M NULL
La Crypte Des Maudits
Needle
nepo-DXM
no3306.bin (Crash Bandicoot 2 hack)
Rainwalkers
supra mayro series
Tower (1995) [?]
Toy Maker
Troisième Personne Du Singulier (2016)
Xocotl: God of Stars
X-Piccies (Amstrad CPC)
Život není krásný
ящики [yaschiki]
..........
M dot strange games
Kanoguti Soft Games
Quimdung Games
Regtamad Games