For my it's Bone's Café.
Imagine overcooked but where you kill and use your customers as ingredients and can raise skeletons from the dead to automate as your chefs and servers. It's overall a very well put together game, especially for one with 240 reviews (total)
https://store.steampowered.com/app/1739070/Bones_Cafe/
I haven't played it couch co-op but the solo play has been really enjoyable
I also really enjoyed cult of the lamb: https://store.steampowered.com/app/1313140/Cult_of_the_Lamb/
It's a game where you are a little sheep creature that runs a cult. It's a mix of a management game and a roguelike since you go on runs to fight the games main bosses and get items to bring back to improve your cult.
Art style kinda reminds me of Klei's Don't Starve and is probably one of the most impressive parts of the game
Though this one is more well known. Still, I hadn't heard of it before so I think sometimes games with even a big following like this one can stay off the radar a bit unless they are truly massive.