Games for Couples

A Way Out from the creators of It Takes Two is a very fun coop experience

Great Idea!
It Takes Two!!!! ;-)
Escape Simulator (did not try for ourselves yet)
A Way Out (was recommended but not tryed yet)
Biped (also still on our list ;-) )
Deep Rock Galactic
We Were Here Series

Enemy Territory is a great game for having some alone time sniping each other.

It doesn't sound like the types of game you normally play but I've had fun having an online date or two with it :)

I've put dozens of hours into Stardew Valley with my girlfriend. You can help each other out in pretty much every aspect of the game, but can also play independantly from each other. If you're going to play split-screen, I recommend getting a second monitor; we found it more fun not to be able to see what the other player was doing right now.

Overcooked is a fun, hectic cooperative game, although it can be rather stressful. Depending on the people playing it, it can either be an amazing experience working together, or they end up yelling at each other because things are just too chaotic and not going the way they want.

To add to what has been posted previously :

• Ibb & Obb
• Labyrinthine (if you want horror game)
• Kinduo
• KeyWe
• Operation Tango
• Clandestine
• Shift Happens
• Them Bombs / Keep Talking and Nobody Explodes
• Unravel Two
• Trine serie
• Toodee and Topdee
• Monaco (better with more than 2 players though)
• Manual Samuel
• Hot Brass (tactical game)
• Unsolved Case (free) / Unboxing the Cryptic Killer (same dev)
• Chained Together

Maybe these :
Fling to the Finish -> You own it.
Joggernauts
Gelly Break Deluxe

• Puzzle Compound
• Timemelters
• Two Climbers

Gears 5
Marooners
Never Alone
Divinity: Original Sin 2
Sackboy: A Big Adventure
It takes Two
Brothers: Tales of two Sons
Tools Up
Vikings: Wolves of Midgard
This games we with my wife very enjoyed. They can be played in Co-Op

Lovers in a Dangerous Spacetime is I think also a great coop game.

Bread and Fred.

Haven

Sea of Thieves can also be very fun together

We already had a couple of similar threads. A recent one was Game Recommendations for LDRs

I enjoy playing https://store.steampowered.com/app/686200/Door_Kickers_Action_Squad/ with my sons.

Some coordination and teamwork is needed, like any couple at home.

Some games where I've had a lot of fun playing co-op:

Parkitect
Astroneer
Ranch Simulator
Valheim
Grounded
Raft
Construction Simulator
Empyrion: Galactic Survival

If you really to test your patience and how well you work together then I'd recommend
Octodad and Overcooked

Stranded Deep. It's a two-player survival game. Very janky, but deeper than you would expect. Me and a friend played it regularly for a while and got into some situations that got us laughing hysterically. It's a bit of a repetitive game before you realize what you really have to do to beat the game, so maybe not for you guys if patience is an issue.

Garfield kart - Furious Racing
Grim Dawn
Divinity original Sin 1 and 2

If you're okay with a lot of dying, then my son and I enjoyed...
Blazing Beaks - requires being willing to get some practice on the bosses (currently in a Fanatical bundle)
Assault Android Cactus+ - needs intro played to have second player unlocked I think, but that's pretty fast

and we did this on PS4, but it's on various things I think, if you want something a bit of a silly shooter...and less grim than the other recent entries in the series. Voice acting in Japanese is better than English, and the soldiers are so polite!
Earth Defense Force: World Brothers

We usually do same screen co-op for the above. But I've also been enjoying Core Keeper a lot, if you like exploration and free-form base building. You can have others join your world. Sort of a exploration-based Stardew mining/Minecraft top-down pixel art mashup.

Not sure what you are into or already played, but here are some recommendations:

Adventure:
Almost all Lego Games
Cat Quest II and Cat Quest III
Never Alone
The Adventure Pals
Justice League: Cosmic Chaos
Lara Croft and the Guardian of light / Temple of Osiris
Darksiders Genesis
Gauntlet
Trine Series
Unravel Series
Smurfs Series

Shooters:
Assault Android Cactus+
Cuphead
Guns, Gore & Cannoli Series
Metal Slug Series
Resident Evil 5 and Resident Evil 6
Left For Dead Series

Management:
Cook, Serve, Delicious Series.
Overcooked Series
Moving Out

I've only played some of these (either alone or in co-op) and a few I haven't tried yet!

Silly Physics:
• PHOGS!
• Human Fall Flat
• Totally Reliable Delivery Service
• Rubber Bandits

Overcooked-Style
• Pizza Possum
• Moving Out (There's a 2nd one too)
• Unrailed
• PlateUp!
• Tools Up!
• Out of Space

Adventure/RPG
• Pile Up! Box by Box
• My Little Universe
• Castle on the Coast
• Nobody Saves the World
• Portal Knights
• The Guacamelee games

Puzzles/Random ones
• Harmony's Odyssey
• PAC-MAN 256
• Out of Order (On sale for like $1 right now)

A lot of rather good recommendations have already been made, but many are online only (you need two PCs and two copies of the game) or are designed for 4 players (they are sometimes not so good if you only play with 2 players).

If you want a list of only local games, and only games made for 2 players, then you can find over 600 of them here:

https://store.steampowered.com/curator/34907518-Games-for-Lovers/lists/

If you don't like them, it's not my fault because I did not compile it. I do find many of the recommendations rather useful, though.

Stardew Valley
Escape Simulator
PHOGS!
Pizza Possum
Flat Heroes
Heavenly Bodies
Keep Talking and Nobody Explodes
Bokura
Bread & Fred
Toodee & Topdee
ibb & obb
Moving Out
Tools Up
PlateUp (better with more ppl tho)
Lovers in a Dangerous Spacetime

and if you're also interested in not co-op, but still fun games:
Bopl Battle
Tricky Towers
Boomerang Fu

Everything coop i had in mind were already suggested

But i just realized an example where i saw couples playing- its very out there but...
Team Fortress 2.
Its multiplayer, shooter, but its the only one where theres a strong casual where 1 of the key classes, if not the most key class, is by necessity a support always beam healing a chosen ally. Its so common finding couples as pairs medic+someone that the community jokingly call medic girlfriend whenever someone have clearly a personal friend that only stick with them.