Hola, Rodrigo, and a very big welcome to the Pixel Joint!
This is a great piece, and really made me stop and look.
I couldn't help but see if Zedeem was right about reducing the colors (you will find that advice a lot here, not because it is an unbending rule at the Pixel Joint, but because fewer colors make pixels look better, and it is really fun to try to keep the number of colors as low as possible!).
My skills are not so much yet, but I did manage to get the "color count" down to twelve, which you can check out here. (though not as good as your ten colors, which I didn't notice until I posted this - sorry!)
I used two dark colors, two light colors, two dark blues, two light blues, two greens and two yellows.
I also tried using some AA on the top edges of the two front faces. I hope you don't mind that I was playing with your pixel - I was just having so much fun because it is really cool!
Thanks,
JD
"...but duuuuudeee.... lower the amount of colors... some could have done this with less than 5 colors."
I've reduced the palette to 10, 5 colors is too less and I don't want to lose too many details.
So THIS is what's happening inside my artwork...like something out of Dr. Suess...
Thank you!
About the colors, someone already said it to me, I'll try to use fewer colors the next time. 
awesome idea and i love it..
...but duuuuudeee.... lower the amount of colors... some could have done this with less than 5 colors.
really love it, hope ya don't mind me borrowing it as my avatar until i get something better (though i doubt it...)