this mock up it's cool

Both the world and portrait look great to me. There's a lot of detail here and I'll have to take a closer look to appreciate it all.

Great mock-up.  Very crisp.

It's not based on any existing GB palette, it's entirely original.

GB color is off?

Nice, I like the portrait a lot above the rest

 Nice job ;D

I really wanna play this

 Nice colours, i would totally play that !

Are the colors white and blue (3 shades)? Because it works very well!   5*

Nice!

There's a perspective readability issue, the sidewalk looks more like a wall. Possibly you might have made the road and sidewalk a lighter tone, to differentiate them from the walls and kerbstones.

This is better than sex.

good mockup! 

Reminds me of Sonic Adventure.  Does an ultramarine insectivore come to save the day?

Nifty work, especially considering you only used 4 colors.  It looks like you used way more. 

Man this is awesome!

Lots of love on this from me :3

Bacause 4 colors is really all one ever needs. Bravo! I'd play that.

looks neat! got my vote!