I have no idea how you managed to produce such a masterpiece in such a short amount of time. Probably the best game I've played so far. It's a shame it's gotten so little reviews so far.
But if I may add some tips, making the threshold/dithering texture mapped to the world space instead of the screen space can make the effect a bit easier on the eyes. Also, adding subtitles, at least in some kind of settings/keybind would be nice in my opinion.
But these are basically just details. Great job, i loved every second of it.