AFAIK:
Defender of the Crown
Lotus (all)
Xenon 2
Alien Breed (all)
Turrican 2
the Settlers
Zool (1 & 2)
Superfrog
Supercars (all)
Sensible Soccer
Speedball (all)
Monkey Island (1 & 2)
Cannon Fodder
Pirates!
Syndicate
North&South
Mega lo Mania
Flashback
Out Of This World
International Karate+
Stunt Car Racer
Chaos Engine
Worms
Fire & Ice
Rick Dangerous (1 & 2)
Titus the Fox
Zeewolf (1 & 2)
Supaplex
Exile
Gods
Blues Brothers
Prehistorik
Magic Pockets
Lemmings
First Samurai
Desert/Jungle Strike
Pinball Dreams/Fantasies/Illusions
Moonstone
Operation Wolf
Brian the Lion
Mr. Nutz
Elite (1 & 2)
Wolfchild
Ski or Die
Dune (1 & 2)
Civilization
Buggy Boy
Test Drive (1 & 2)
Prince of Persia
Rodland
Nitro
Soccer Kid
Wizzball/Wizzkid
Ironman Offroad Racing
Bubba & Sticks
Humans
Lost Vikings
Cisco Heat
Yo! Joe!
Future Wars
Elvira
Shadow of the Beast (all)
Populous (1 & 2)
Zany Golf
Lollypop
Skidmarks
All Terrain Racing
Body Blows
Fire Force
Navy Seals
Sleepwalker
Alfred Chicken
Dynablaster
Street Rod (1 & 2)
Traps 'n Treasures
BC Kid
Chuck Rock
Putty
Gobliiins
R-Type (1 & 2)
Cadaver (1 & 2)
X-Out
Cruise for a Corpse
Crazy Cars 3
Ugh!
Shufflepuck Cafe
Virus
James Pond (all)
These games are really Amiga-ish, IMHO :-)
Not necessarily classics, nor are all the classics being mentioned, just the most Amiga-defining games...
(/me is starting up my a500 :oops: )