Some comments:
1. I don't like the "Nate's Arcade" font - too plain. Also, I'm not sure it is necessary.
2. Your button layouts are "off" meaning they aren't oriented the same way - Is there a reason for this? I would make P1 and P2 controls exactly the same.
3. I would move the "Go" button to the other side of the CP and leave the Exit button by itself. You don't want to accidentally exit out of a game when someone meant to hit the Go button instead (whatever a Go button does).
I like the colors and layout otherise.
