You bump a thread after 45 minutes, when it's still at the top of the forum?! Be a little patient!
I can't see the Game Boy camera working easily. There is an instructables page
which gives some details of a circuit that takes the Game Boy camera to UART using an ADC and PIC - the Pi has no analogue inputs, so you'll need to use something very similar.
Seeing as the Game Boy camera only has a resolution of 128x123 and either 2 or 5bits/pixel, you'd be better off using the Pi camera or a USB camera.
Software Engineer at Raspberry Pi Trading. Views expressed are still personal views.
I'm not interested in doing contracts for bespoke functionality - please don't ask.