People are asking for traditional roguelike recommendations? I'm always last to know.... Rogue. Play Rogue! Rogue Clone IV's free and available for lots of things, on Linux you can literally compile Rogue itself for your machine, and the Atari ST version has actual graphics.
Rogue is a marvelously "sharp" game, by which I mean you have hard decisions to make. You can't just play it safe and never use items, you'll never make it if you don't experiment and learn what they do. Hunger prevents you from grinding for experience or searching every space for traps.
You have to take risks to win. But it's also short! The longer a game the more disappointed you'll be when you lose, and in Rogue, probably, you'll always lose. You're probably doomed, but it's fun. Even good players usually die. Have fun with your doomedness.
That's the reason Rogue has a scoreboard. You're playing for a high score.
Follow up: the Amiga version of Rogue, which also has graphics, is literally on the Switch eShop! It's $8!
I went to look up Amiga Rogue, having not seen it before, and I like this title book
