Wow the art is just off the charts on this one. Did you put together a shader to make it happen or are we looking at the raw art? Pretty amazing!
Viewing post in Ecaroh's Scythe jam comments
in this build the only shader doing any work is one that locks the colors to the two-color palette (to catch any stray alpha pixels, or mistakes in my pixel art, like using pure black & white instead of the tinted palette)
The bulk of the effect is simply from having this overlay, which i made at a higher resolution than the game's actual pixel art

I just used Aseprite's dithering radial fill

This creates the effect of dithering sub-pixels basically, the further from center screen, the darker the pattern.

The last trick is swapping objects' layer from behind to in front, so i can selectively disable the dithering on certain objects
This is how some of the raw pixel art looks:
