I don't think we should stick to just commercial games as the amiga had a lot of great pd/shareware games which really had an impact.
EDIT: Oh and make sure Total Chaos isn't in the list
The following games have to be included! In the UK at least these games were extremely well known even with people who didn't really know anything about the amiga, they stood out from the crowd and cannot be excluded imo.
Shadow of the Beast
Defender of the Crown
Sensible World of Soccer