muln

Bernband and Stomp Plonk are both quite nice

might not quite be what you're lookin for, given it's more of a momentum platformer; but the lack of any real "fail" state and the ability to reverse time at one's leisure help it slot into that nice low-stakes vibe for me:

Zineth [Spring, 2012], by Arcane Kids (https://zinethgame-blog.tumblr.com/)

it's a wide-open open-world exploration thing, with the single objective of "skating your way to the moon". main draw is just figuring out pathing across the abstract rooftops of buildings, grinding and wallsliding in order to get Higher, with tons of weird little nooks and crannies to explore. There are a good amount of NPCs, but dialogue is sparse & interactions are kinda limited to challenging em in a little minigame "vs. mode" battle thingy, taking place entirely within a tamagotchi-like app you've got on your phone/menu UI

gamejolt link's dead so mediafire's the only place you can really download it anymore, but it's still worth giving a try imo! (and best played with a controller, but not required iirc)

Babbdi is really good

Sewer Rave should fall under this category, right?
I've also downloaded C'est La Vie last week but haven't played it yet.

Morels The Hunt technically has points and so forth, but they barely matter, I just like it as an excuse to walk among trees, although that might be a bit too little to see for what you're thinking of: https://store.steampowered.com/app/1156590/Morels_The_Hunt/

Crypt Worlds comes to mind, and apparently its sequel just came out, although I haven't tried it yet: https://lilithzone.itch.io/crypt-underworld

do the Frog Detective games count, or are they TOO narrative?

Broken Reality borders on ironic or gamey at times, but I still really vibed: https://store.steampowered.com/app/757480/Broken_Reality/

Electric Highways is purely just finding your way around with no interactions (as far as I remember?) but bonus points for being in a genuinely old engine: https://zykoveddy.itch.io/electric-highways

A Mall Near You is kinda like Co-Open but in a slightly fantastical version of depressing capitalist reality: https://dieselrave.itch.io/a-mall-near-you

Cosmic Commute is almost too (literally) linear to count, but the characters are still fun at least: https://billy-dent.itch.io/space-mykee-officer

Wrong Box is more of a series of self-contained vignettes but it's still neat: https://mollysoda.itch.io/wrong-box

Party Darling is a little less explore-y and more game-y but it might still scratch this itch: https://sweetheartsquad.itch.io/party-darling

Payroll is interesting because it explores a fairly small space, but changing over time: https://astrojone.itch.io/payroll

So many good recommendations in these comments! This is a subgenre I really like.

I enjoyed A Mall Near You (https://dieselrave.itch.io/a-mall-near-you), which has some spookyness but I wouldn't call it an horror game.

adventure games but foreground silly little interactions over puzzling

a couple times i've tried my mod mr. friendly with levels i've never actually played "normally" ie as normal Doom combat experiences, and it was an interesting feeling exploring a space for the first time in "chill out, screw around, talk to folks" mode.

iirc A Bewitching Revolution was more adventure game puzzle-y than silly interactions but i remember enjoying it.

Endless Express is one of my all-time favs. I bet you've played these, but just in case:

it's tiny but The Fish Market is a good one.
https://fisho.itch.io/market

Dr. Langeskov also comes to mind, did you ever play that? more linear but nice and silly.
https://crowscrowscrows.itch.io/dr-langeskov-the-tiger-and-the-terribly-cursed-emerald-a-whirlwind-heist

a game called Soup 0.9, if you like minimalist art-games or LSD Dream Emulator