All I can say is that I had a ton of C64 games back in the day, and I wouldn't consider any of the winners as the finest art the commodore had to offer. Attack of the Mutant Camels? Seriously? That camel could only walk forward, and that was even animated poorly.
When I think of artistic c64 games, these titles come to mind:
Forbidden Forest/Return to Forbidden Forest
Maniac Mansion
Wizball
The Last Ninja games
Impossible Mission II
Samurai Warrior: The Battles of Usagi Yojimbo