Just getting back into things so the memory might be a bit fuzzy, but the ones I remember loving:
Scorched Tanks - one of my all time favorites
Lemmings - one of the most innovative games ever
Cannon Fodder - one of those games that is beyond fun
Ports Of Call - many all nighters spent playing this game
Pool Of Radiance - what can i say... big D&D fan
Zool - really fun platform game
Banshee AGA - great graphix, great fun shooter
Super Frog - probably my all time favorite platform game
Shadow Of The Beast - first game i ever played on the amiga and the one that allowed the amiga to steal my soul
Sim City - the original spent 100s of hours playing it
Populous - main game for an entire summer