My favourite games...
Turrican 2
Rainbow Islands
Rock'n'Roll
Slamtilt (and the other 21st Century Entertainment titles)
Robocod (James Pond 2)
Hybris
Project X
XR-35
Robbeary (not many people know this title)
Whirligig (hard to play on a 320x200 screen though)
Populous 2
Speedball 2
Gods
And I'm sure I'm forgetting a few.