Yup, looks like it jumped straight from Metal Slug.

Well, I cannot really agree with xXHalfieXx in some points.

I think 62 is a large enough colorcount, you shouldn't use more, though a bit more optimized palette would definiately improve the piece. Not sure about less saturation, maybe would fit the metal slug style a bit better. But definiately no more dithering. I'd actually suggest a lot less considering it is of metal.

I like the design, what it's lacking in my opinion at the moment is the definition of shapes and it seems as if some pieces were only dropped onto the sprite without considering its effects.

Whipped up a quick and dirty edit, to show what I mean.