Brogue: The Most Traditional Road

The lighting and the color palette especially like the first time I ran into like a lava pit. When it lived like it felt like the whole place was just like illuminated in a way that I'd never seen in an ASCII character based rendered game so that's one of the first things that struck me as beautiful. And then after you design the shadow casting algorithm just to determine which cells are visible and which aren't. It's actually not that hard to go from that system to full color lighting. Because it's a turn based game so like really the CPU is not much of an issue. You don't really have to worry about using too many resources.