It basically adds some scanlines, a bit of noise, some contrast enhancement and a subtle vignette. Do you think it's too much, or even too little? I also tried:
- Chromatic aberration, but even just one single pixel made it too distracting due to the low res of the game.
- Some distortion/curve to simulate an old TV, but without using a linear filter (which is a no-no with pixelart, specially this low-res) it looks awful.
In any case, I want the filter to be on by default, but to be easily disabled in the options menu.