So I bought this, opened the read me and the first things was "turn off interpolate colors between pixels" and I was like nooooooooooo because I don't use pixel art. I tried it anyway. It works perfectly fine with it on. Not sure why it says to do that but it didn't crash and the effect looks great. I'm using 1.4x so maybe it's only with 2.0 that it doesn't work so well with interpolate on?
I was literally going to make this same shader which probably would have taken me days to figure out. $5.00 totally worth it.