Haha, cool.
It's simple and nice. Good time-waster.
Liked: The character, he was cute and well designed. The whole art style was consistent. I very much enjoyed finding the right parts, a great sense of achievement when I did.
Disliked: I can see this becoming boring after a while, and so does the music.
To Improve (If you make a sequel): Good game! Try to make the stages a bit harder and make it so only parts of a certain group of unrelated, random robots appear. Maybe a skin chooser (possibly even playing as robots you unlock).