You're keen! It's a great game though isn't it?
I play it on MacMame, you can get the backdrops for games online.
Have you tried the 2600 version?
I've not tried 2600 emulation on the GP, it sounds like it was never fully developed.
Shame really, there's some quite fun 2600 games out there and at 4k each you'd fit the entire library on the smc!