Having recently played some retro games on era appropriate hardware, I'm actually a little sad CRTs are gone.
Obviously they were heavy, hard to manufactur safely, and were filled with toxic materials, but man are they like the perfect anti-aliasing tool for retro games. I'm sure some good filters exist to replicating it on newer monitors tho.
Overall tho I am glad both of these things are no longer the defacto used tech.
Not fully complete, but theres Ultrakill. Its very good.
Theres also Trepang².
These are both pretty fast paced indie FPS tho, so if your looking for something a bit slower you might like GTFO. Its primarily coop but has bits to play with and a bunch of content.