alright so here's the deal: Throw in nominations for good amiga shoot em ups. In this case, we're counting games in the vein of project X and SWIV. So horizontally or vertically scrolling "spaceship" type of games (even if the character is not a spaceship, ala wings of death).
Maze or platform shooters (alien breed, turrican) don't qualify here.
Basically, nominate any amiga titles that you enjoyed playing, and which qualify. Once we have a decent list we'll do a vote, and eliminate games until we're down to the best

edit:
To kick things off -
Banshee
SWIV
Project X
Agony
Apidya
Disposable Heroes
R type