Do you think you'd be able to post each screenshot in 800x600 resolution? Not only would it look much better, but it would give us an exact idea of how it would compare to other graphics.
I'd suggest to use paint.net for making your custom graphics, saving .gif images in MSpaint makes them pixelated. Also, there are 1x1 pixels in the letters of the custom player blocks.
Is there anyway you could have just made custom graphics? Oh wait you could just put the custom grapics in the grapics folder and include that folder too.