Yeah I got the Steam version too so if you ever up for coop I'm down. Though to be honest, I haven't been playing the Steam version much these days because my intense progress was in the PS4 version, so I can't transfer everything into the Steam.
It's basically starting over from scratch and not sure if I want to do it all again due to having multiple playthroughs benefits that makes the original playthrough look like a cake walk. I'll probably hop on it again when I delete the PS4 version for memory or something. It's real fun though, especially with certain builds.