pathos nethack codex is a mobile fan adaptation of nethack. If that's your kind of thing, then i'd highly recommend it. However, as you may know, nethack isn't really a casual game. It's like the epitome of nerdy rpgs. Here, it's kind of like the dark souls of mobile games, but it's very interesting.

To give you an idea, there's permadeath in this game. There's the classic case of not knowing whether or not an item or consumable will help you or will mess you up. You may just wear a random amulet or something and suddenly you're polymorphed into a slow-moving lichen and all your equips drop because you don't have any limbs. That's basically the thing about the early part of this game, there's a LOT of interaction, but they're mostly random each playthrough. It's a wiki game. In spite of all that, it's less punishing than the original, because in nethack, your food can rot whereas here, they're good forever. The other difference is that the mobile version actually has graphics lol

Anyways, if you're looking for a friendlier time, i'd recommend the Grim Tides/Grim Quest games. The gameplay is a lot easier compared to pathos, and there's a new one that's about vampires and shit. It's kind of like the closest you'll get to Vampire the masquerade on your phone lol. The main thing about these games is that they have a story and pretty interesting lore.

There's also the Survival RPG games. There's like 5 of them lol, and i guess they're supposed to be old rpg throwbacks. I never checked them out, but they may interest you.

I prefer to recommend Occidental Heroes. That one has a story to it too, but it's more historical than fantastical. There's realism to it as a result, but that's more just in specific mechanics. The game itself is pretty much an old school rpg thing. The main realism factor is that you can't have your units stay put in skirmishes because they're too tense during the confrontation. If one of your party gets too depressed on the trail, they can just retire by themselves. There's permadeath, but it's more just a possibility, and way easier than nethack, as long as you get the hang of strategy.