Undertale on CRT TV
Just for the heck of it, I played Undertale on an old TV in my basement! It's a large, flat screen (as in, the glass is flat) Sony Trinitron CRT TV, using an HDMI to RCA Composite converter, at 720 x 486 NTSC resolution
As retro as Undertale may seem, it's really made for modern HD monitors, since its finer details, especially on the battle screen, are easily lost. It's like a retro game, but it's not 100% authentic to a true retro game. Which was probably never the point, so that's fine.