Games for Couples

The Binding of Isaac.

Some fun games I like playing with people:
Battleblock Theater
Escape Academy
Red Rope: Don't Fall Behind
Tabletop Simulator
Tabletopia (Free)
Wizards of Legend
Hammerwatch
Feel the Snow
Viscera Cleanup Detail
Raft
Borderlands 2

My partner and I are going through a co-operative multiplayer campaign of Stellaris and having a blast.

Beyond Two Souls
yes, have coop local(or use Parsec)

play cs2, it's fun!

https://store.steampowered.com/app/1086940/Baldurs_Gate_3/ - IMHO best CRPG of last two decades!
https://store.steampowered.com/app/1062520/Dinkum/ - Sweet Australia sim
https://store.steampowered.com/app/322330/Dont_Starve_Together/ - rather hard and specific survival game
https://store.steampowered.com/app/1432050/Nobody_Saves_the_World/ - Funny story game with gameplay, focused on builds of metamorph characters
https://store.steampowered.com/app/1623730/Palworld/
https://store.steampowered.com/app/2015270/Rotwood/ - Nice party rouglite. You can invite some randoms if it would be too hard
https://store.steampowered.com/app/1604030/V_Rising/ classical vampire survival game. Default server setup is super grindy. You may want to change it to more comfortable
https://store.steampowered.com/app/972660/Izdanie_Spiritfarer_Farewell/ super cool story driven adventure. One of players will become huge white cat, who can't talk. Several last clients seemed to me rather unpleasant
https://store.steampowered.com/app/330020/Children_of_Morta/ - Nice rouglite
https://store.steampowered.com/app/1621690/Core_Keeper/
https://store.steampowered.com/app/344740/CRYPTARK/
https://store.steampowered.com/app/1274570/DEVOUR/
https://store.steampowered.com/app/840010/Garden_Paws/
https://store.steampowered.com/app/780290/Gloomhaven/ - Hardcore tabletop game
https://store.steampowered.com/app/1356280/Kitaria_Fables/
https://store.steampowered.com/app/1169040/Necesse/
https://store.steampowered.com/app/1347970/Patch_Quest/
https://store.steampowered.com/app/739630/Phasmophobia/
https://store.steampowered.com/app/1432860/Sun_Haven/
https://store.steampowered.com/app/1361510/Teenage_Mutant_Ninja_Turtles_Shredders_Revenge/ - very oldstyle beat em up
https://store.steampowered.com/app/1150530/Wizard_with_a_Gun/ - we've dropped it on the middle
https://store.steampowered.com/app/1313140/Cult_of_the_Lamb/ - the second player will play as lil goat)
https://store.steampowered.com/app/527230/For_The_King/ - nice tabletop. The second part, IMHO trashy
https://store.steampowered.com/app/215530/The_Incredible_Adventures_of_Van_Helsing/
https://store.steampowered.com/app/211820/Starbound/ - with FU revamp only!

One that hasn't been mentioned before: https://store.steampowered.com/app/22450/Hunted_The_Demons_Forge/
I hear it's great in coop.

I love those threads! I always find new couch co-op games to play!

Some great additions to the list, and they both have hilarious commentaries

• The Cave if you like co-op platformers it's a great one, with replay value as the cave changes depending on your choice of characters
• The Deadly Tower of Monsters is a retro shooter with an awesome B-movie feel. Great to play as a couple. Just be warned: your characters will die. A lot. Not because the game is difficult. Just because you will be laughing your ass off to the commentary and getting killed while you're trying to make sure your drink is not going back up your nostrils.

Also adding:

• Knights and Bikes, a narrative adventure game with a solid story where co-op is crucial. I think you can actually play it solo by switching characters but it's a much stronger game when you play it with someone who has your back.

https://store.steampowered.com/app/1515210/The_Past_Within/ Co-op puzzle game by Rusty Lake
https://store.steampowered.com/app/2719150/Holo_X_Break/ Recommended for Hololive fans, beat'em up game, can be co-op or single

Some games I really enjoyed that I know support co-op and haven't been mentioned yet.
Lightyear Frontier
Oddsparks: An Automation Adventure
The Planet Crafter

With my ex we loved boomerang fu! If you are on the same team you can cooperate to take down the bots.
Out of space is also a collaborative game, little stressful if you are only two but we liked it too

We loved the LEGO Star Wars games (at least the OT and some of the Prequel titles). We're actually taking a break from the LEGO LOTR game to play the aforementioned Stellaris.

I definitely recommend digitized co-op board games. One of the best purchases I made was Tabletop Simulator, which has literally hundreds of board game mods in the workshop including lots of co-op options.

We enjoyed the collaborative puzzles and weirdness of The Adventures of Cookie & Cream
Also Smash TV for it's retro charm and endless coop twin stick shooter fun

I'd like to recommend retro games in general because exploring this bygone era together is really fun and you can sometimes laugh at how awkward and weird everything is, it's a different kind of experience, almost like archeology.