Ah, Quake, I don't know who "Beano" is, but thanks for the best wishes. It looks like there was a lot of well done pieces for this week's challenge.

Thank you for your feedback, WreX.

Reminds me of Beano so much. Really cool style.  Good luck!

from what i saw in google that black part is like  magnet parts i suggest just do shadow near them so there will be shadow like on the white part maybe give it a little bright color at the top so the shading would look like you can see a little of the top of the object will also suggest using less inside black lines between things and using good shading that shows the object right and maybe shadow from parts to parts to separate between different parts of it colors could also improve im not sure myself how to explain good and bad colors but you can check out good pixel artists here and see colors they use on different materials i think there should be also some more details of shading for example some shiny parts on the transparent plastic parts 

also tip you can use for allot of your work is try to make the top of objects visible it gives more realistic look