well, after looking at it, it's still missing levels, enemy types and the wave generator. I can also report collision detection problems and scroll issues when dropping through a chute.
good one midway. on a system 100x more powerful than the original you can't quite get marble madness to play properly? or is it that it's hard to fit all 128k(?) of marble madness into that tiny 4 megabyte gba cart... my atari800 version played better...
the worst part is now generations of kids think marble madness sucked. well, it did, but not nearly *this* badly.