EnthalpyFlow
To answer your question, let me ask you one in return. Are you looking for some tiny roguelike for casuals to play in between Skyrim sessions, or are you looking for the real thing?
If it's the former, then by all means, play what has already been suggested in the thread. But if it's the latter, then sweep away all that casual crap and play the one roguelike to rule them all.
The roguelike that has been in development since 1987 and still is. The roguelike that despite being in ASCII itself, now has a glorious 2D isometric interface, and will soon have an even prettier one.
The roguelike that if you abstain from looking up hints online will take many years (if ever) to complete, by gradually building up a knowledge-base of lore, a unique feature of this game you won't find anywhere else.
https://nethackwiki.com/wiki/Vulture