As a very casual rogue-like enjoyer (failed to ever kill the unicorn in nethack), I regularly enjoy Rogue Fable III. There’s not a ton of story or content, but all the essentials are there.

It’s a generic dungeon with various themed levels. (No puzzles.) Minor lore through occasionaly messages by the underlord or by reading signs/messages. Get the keys from guardians in side dungeons, then beat the big wizard and take his goblet of immortality.

You get a race for basic modifiers (no weight limit, but only move horizontally, for example).
You get a class, which determines your default talent/spell list.
Then you can get some extra talents/spells regardless of class from books/altars/librarians.

It’s simple, but I enjoy doing it while listening to other things. No direct challenge modes, but various race/class combos are more difficult than others.