Me and my girlfriend actually just played It Takes Two. Absolutely phenomenal game. Really fun to play and a bit emotional for her due to family problems. But an amazing game. Be ready to really learn how to play well together to get through some of the bosses. It took us about 2 weeks off and on about 1-1.5 hour play sessions, but it was so worth it.
A fun fighting game that gets away from Smash Bros clones is Stick Fight. Even good for more than 2 people!
Howdy, I got some input. My partner and both play on steamdecks.
Saw this in one of the comments below but:
Lovers in a Dangerous Space Time
Is a blast and I e of the few games you need another person to play with. The more the merrier.
Heave Ho
Solid party fun.
Laura Croft and The Guardian of Light
It's a $1.49 during the summer sale. Played this a while back. Phenomenal time.
PS: It says unsupported but I just booted it up and it loaded just fine, just tap the screen or use the track pads to get past the setting screen that loads up. Local co-op works and you can invite a friend.
Pico Park
-Simple game but get great for groups
Unrailed
-Recently had an underwater update and it's been a jive to play. Vibrant colors. Voxel art style, everyone gets into a rhythm. Played with 4 people last week. Deck friendly fun.
Nidhogg / Spiderheck /stick fight / Starwhal /duck game
Different flavors of the same kind of couch co-op mahem
Plate Up
New spin on the restaurant, cooking genre
Shovel Knight
GEM!
Splunky 1&2
Just tried this game. So far so good.
Ultimate Chicken Fight
If you like Battle Block Theatre
Wildermyth
Procedurally generated RPG with paper cutout art style. Play this with a couple friends had a good time.
Shift Happens
It's a partner platformer
! If you get into Emudeck, Netplay is a thing, so is Parsec, but local play for console games works so well on the Deck!
Trine 2
Played it on my nividia shield. It should work on the deck.
Tetris
The new versions is a strangely addicting party game.