Games

Outward is pretty fun (and at times bs and challenging). It is also not that long of a game to finish. The soundtrack is also good.

Super Mario 3 is pretty sweet

Has nobody mentioned Barotrauma? Had a few hundred hours of fun with this, my buddy and I. Especially if you don't mind shit being not very shiny. It is unique, and it keeps on giving.

I'd highly recommend Stolen Realms. Pretty cheap too

It's a hex grid turn based game. You can have up to 6 characters (difficulty scales per character) and can each control as many in the party as you want. Turns are taken as enemy, and players with the players able to act at the same time so you aren't waiting too long if you are communicating about what you want to do.

It has multiple "classes" with skill tiers that require you to take a few from that "class" but you can spec however you want.

The roguelike mode is very fun for quick sessions and will reward you with a choice of random skills and armors after every fight, but it also saves if you need to go and play later.

Core Keeper comes out of Early Access soon I think and should be up your alley

I enjoyed playing Toodee and Topdee with my roommate. Fun puzzle game. Can be played singleplayer or multiplayer. https://store.steampowered.com/app/1303950/Toodee_and_Topdee/

Minecraft Dungeons is also quite fun for co-op. https://store.steampowered.com/app/1672970/Minecraft_Dungeons/

Diablo 4

Cult of the Lamb's latest content release is bringing 2-player local coop

There's a game on Kickstarter called Outbound. It's in alpha access right now.

The game looks like it's literally Raft in a camper van. Haven't tried it yet but I plan to.

Steam link