Don't be angry dude. I keep noticing that the majority of your negative comments relate to color selection and contrast. Your pixels are good, your pixelling too. Those two areas are not being received well by viewers is quite clear. Others should be so lucky, these things are waaaaaaay easier to improve upon. You'll go from extremenly dark pixel with no contrast or things like this where the color green is just not right and the development of the volumes and shapes are weak.
There is a thread right above this one that helps calibrate monitors. It may be your problem.