You should try Lovers in a Dangerous Spacetime. I think it’s up to 4 players, but essentially you both walk around a 2D side perspective ship and can control the different weapons and power systems.

You both have to run from station to station to navigate a large area and fight and defend from enemies and accomplish tasks. It starts easy and gets actually quite hard despite the art style. Cooperation is vital.

I’d also recommend Cook Serve Delicious, either the second or third, both are great games for one or two players. You essentially run a kitchen on a day by day basis. You have a menu of items you must cook for customers that come in throughout the day. Cooking requires pressing combinations of buttons to add ingredients depending on the customer’s special order for the item.

In between customer orders you have to handle cleaning tasks and there are rush hours throughout the day where tons of customers arrive. When it’s going full tilt you’re rapidly taking orders, putting food together, and sending out food, it’s extremely fun and as challenging as you want it to be since you can choose what you want to have on the menu if you’d like.

I like that you’re purely focused on making the food and accomplishing tasks unlike Overcooked where the challenge is more about getting the ingredients from place to place and having only two players makes it ultra difficult. CSD scales much better to the amount of players.