Enter the Gungeon is another good bullet hell game. Slay the Spire if you like deck building. Both easy to pick up and stop.

Halls of Torment and Brotato are both similar to Vampire Survivors, but better in my opinion. Great art styles and the weapon system in Brotato is really fun.

Casual-wise, story-based games are nice, like Frog Detective, Florence and the like.

Dave the Diver. I had put down gaming because of tiredness and this game was such an unexpected joy of exploration and cute story for me. Easy to pick up and do a quick dive, decent progression based on a mix of skill and leveling up your character, and the writing was excellent. First game I 100% in forever and it was while playing it 30 minutes at a time.

Factorio, it can be casual, but eventually it will steal your sleep

UFO 50

If you enjoyed arcade or NES style games

Stardew Valley is the embodiment of chill

Dredge has been one of my favourites. Just be aware that the game starts harder than when it ends.

Tetris :)

I am running Tetris for the PSP on my Steam Deck and I love it!

I play Hardspace Shipbreaker when I want to relax.

You are a worker in a spacedock and dismantle ships with a cutting and grappling tool and divide the components into resource bins. It has a chill soundtrack and it's fun to float around with thrusters and figure out how to separate the different parts.

I asked a similar question quite a while back. What ended up feeling good for me from the recommendations was Oxygen Not Included surprisingly. I thought it would be too much but just trying to figure things out on my own was fun, and I found myself falling asleep to thoughts of plans for my colony. Surprisingly addictive and chill, maybe because I could pause and think anytime things started going wrong.

But I also gotta recommend Outer Wilds if you haven't played it already. Exploration, mystery solving in a chill solar system environment. Go in blind is the best advice for that game but I found it super chill and relaxing.

Project Highrise might fit the bill, it's pretty relaxed and lasts forever.

HoloCure is another take on Vampire Survivors genre, but with slightly more complex mechanics (closer to a twin stick shooter) and VTuber themed characters. It's also completely free on Steam as it's a fan made project, but that does not detract from its quality in any way.

Here's a slightly different spin on "computer games"

I have Boardgamearena.com in the background of my browser. I often have a few board games going at once. You take your turn, and it alerts you when it's your turn again. There are also games you can play solo if you don't wait to wait around for others.

Try some cozy games, like Animal Crossing, or any of the dozens of other farming / crafting games. If you want 3D, Slime Rancher is a good option in this category.

Destide has already mentioned Stardew Valley, which is also a great choice.

You can also try some not-difficult side-scrolling game, like Rayman Legends, it has some difficult levels, but most of the game is very chill.

Balatro. Can get it on your phone, Switch, Steam Deck. It's the poker-based rougelite. Sounds weird, but it works, and super easy to pick up for a hand or two and then back to work.