I like your style in this.  Gives it a real enemy boss appearance from a 90s side scrolling game.

Excellent spritework!

Such beauty.

 awesome !!! 

that's a really cool design!  good work.

 This one really caught my eye, the little touches of texture on the body work really well.

 Amazing!
Only little thing is there's this "smudge" of highlight on his left shoulder (on the viewers right), where the shoulder meets with the back.
 

 Very interesting color palette! And a very well done robot!

Orkimides in the Shell! ^^

genial :D definitivamente tenes que animarlo

This needs animation!

Great pixelling as usual. I really admire how clean you keep your work. Can't wait to see more!

Looks amazing, nice work!

The pale greys/magentas are not my cup of tea to be honest, but you utilized them very well. The eyes have a certain wow effect.

Excellently pixeled. :)

 yooo if this had animation. nice work!

Is it a good or a bad guy?

Looks very nice!