either Lotus ! (excellent track scrolling, great difficult curve, the best cars game ever for me with pod) or Xenon II (great design, just so hectic) these were the first 2 games i ever played on amiga. but i think thet they couldn't be considered amiga specific.
so maybe... Perihelion
don't know really why, but it may have to do with the design so sound and compressed, solid, that i've never seen on a pc for instance...
so this is mine; c'mon who will say Frontier at my place?