Probably going to be the only person who says Buster Brothers. Something about the worldwide aesthetic and all the bubble sprites flying around made it...
It's a tie between 'Tumblepop' and 'Snow Bros.'. The real challenge was not in their difficulty but in learning all the tricks to make their journeys as fun as possible, speeding through the levels while gathering loads of points!
Comments
..pop.
Other favourites include
Bomb jack
Ms pac man
Tumblepop
And the mighty Pang! only second to BB