Frozen Soul/DG: Very complicated puzzle/exploration game. You play as a Sleepwalker, a dying blood with the unique ability to fast travel through the Dreamsphere. When I say complicated I mean complicated, you will be using the wiki for everything, but it's my number 1 on this list and probably instrumental to who I am as a person.
Cute Girl 555: Strangely philosophical singleplayer horror (?) game. I can't properly explain it, just go into it blind with the time to actually think about it. One of my favorite story games and a necessary play if you're into that kinda thing.
Blood, Sweat and Pixels: Fast paced free for all fighting game where you're given 3 random items (melee, ranged and utility) each time you respawn. The pixel-y art style is super cute and it's got a bit of a learning curve but it's really fun once you get a feel for most of the items.
Da Amazing Bunker Simulator: Extremely grindy afk-farming/badge hunting combo. Most of the first screenshots on this blog come from there. They don't remove any of the old memes and the game is rlly old so most of it is SUPER dated its nice.
PHIGHTING! 5v5 class fighting game based off classic roblox. It has a big fandom but not nearly as many actual players... Lots of fun worldbuilding and characters. Also very good fanfics (ily heart of iron).
Project Remix: Kitbuilding fighting game. As of writing this, it only has about a hundred concurrent players. It's super underrated and has some of the best music I've heard in any roblox game. Much faster paced than Phighting, you'll die instantly. A lot. I play support (bad idea in this game) and Magician's Tophat only kind of makes me wanna kill myself!
Jim's Computer: Short horror game about watching everything fall apart in front of you and not knowing what's really happening. No jumpscares. Extremely touching and soul baring depiction of psychosis that closely reflects my own experience with it (especially the ending).
Desert Bus: Hangout/achievement hunting game. It's just a bus simulator, so if you've played one you've played them all, but this is my favorite of them. Very cool emotes and super fun to hang out in if you get a talkative server.
Break In and Steal Thingz: Keeping this here for transparency but honestly I can't recommend it anymore, I don't agree with the devs' decision to fire milk and ruin her life over shit that should've stayed in dms
Running From the Internet: Kitbuilding nextbot game where you actually fight the nextbots (or other players). Has sort of a mario kart feel despite being a fighting game. Hard to get good at, especially if someone's kit is full of expensive items, but not as p2w as you'd think.