Whoop, I mixed up dark souls 3 with Elden ring. Though, the same applies. I did like the gritty atmosphere and lore. The main issue I had was the learning curve and when trying to playing co-op there was no way to turn off strangers joining what I recall. But I bet by now there’s mods for all of that like you said.
I loved every bit of Rain World! But I ended up quitting it mid play through when it became too hard. I found a way to gather stacks of berries to have enough reattempts for the hard parts, but then got lost where I was even supposed to go and gave up after ~25 hours playtime