There are isolated fat pixels(the eyes , the buttons) and even some staircases, but I know what you mean, tried to fix it temporarily with shifting around colors and adding a double hugging outline, will experiment some more soon.
I've read Cure's tutorial several times, but it doesn't hurt to do so every once in a while.
Tried my hand at blurry aa, turned out more bandy than blurry, won't keep it most likely, but was fun to do anyway.
Regarding the palette as mentioned this one is temporary, I thought of having the final one with fully saturated colors aswell, but I don't find that as distracting as it should be, maybe if I can figure out which color-combination are generally regarded as unpleasant to look at and have them fully saturated fully contrasted it'll work out, the problem is I can't seem to find any thing about "ugly" color combinations all the tutorials/articles I've encountered so far deal with harmonious and pleasant color-combos.
Update: