Outer Wilds. but in fear of spoiling it, I cannot tell you what makes it good. Jump in without knowing anything about the game is the best way to enjoy it.
I saw some people recommending me commenting the games I like:
Stardew Valley
Bioshock Infinite
The Last of Us
Call of Duty
Since you liked Stardew Valley I would recommend 'Graveyard Keeper'. It has a very similar play style and feel to me. Though a pretty different setting. I picked it up on a Steam sale and really ended up liking it.
You might have a look into arena/match like multiplayer games, I found they match the 20-30min gameplay and moving on very well. Closer recommendations would need more information about your interests in games. Good luck!
Roguelites sound like a good fit for something to quickly grab your attention. There's all kinds of them but I'll go ahead and list off Hades, Dead Cells, Risk of Rain 2, and Streets of Rogue as just a few of the greats.
Deep Rock Galactic, as mentioned elsewhere, is also amazing. Depending on the type, you can do a mission or two in a 30 minute timeframe.
Have you played Noita?
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