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C&C Please.
:>

It's nicely done except for the lighting.
Your shading is symmetrical (except the shine on the eyes), which makes it seem as though the light source is somewhere in the center.
Most pixel art has a defined light source in the top left or top right corners.
It's fine if you want a light source in the middle, but I doubt it's in the middle of the robot's face (which is how it appears now - notice how every edge of the face is bright, then fades outward?).

supahninja - I fix the eye shading.
The ligth come from the front.
Thanks for the comment ^^

Finished:

Thanks Focz for the help on ideas :>

Nope xD

And, wow, I loved the final version.
Light efects, colors, details, etc.
Everything awesome.
11/10

Thanks Focz ^^
I spend 12 hours in this robot

I prefer this version, without the... er... sound box, i think. Good work, 10/10

Its a wheel :P
haha
Thanks ^^

Well, the final version turned out great.
Nice job. ;)
However, the connections between the wheels and the body seem a bit small to be practical.

Thanks.
I'll try to fix that.
I see this too.
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Edited:

I really hate the... wheels?

Also work on your lighting