It sort of looks like Rock from Rockman Dash. But yeah not bad man.

I agree with Commodore..... it doesn't look like Megaman at all really..

Doesn't look like a megaman :P

The block-and-ball style is interesting - pretty cool actually. But I'd have to agree with dragonrc with using a lighter colour for the blaster/foot/hair instead of block - and maybe add a some outlines of detail there. The arm/glove part also bothers me a bit because the pinky part of the glove is so far away from the actual arm itself.

you should remove the bg, and dont make the hand and feet totally black but just dark blue.

I like the head, its done pretty nice