I've always imagined what a port of Sonic 1 for Amiga would have been like. I imagine it would have had a larger color palette compared to the Genesis version. Something similar to the SNES version that I will leave here as an example in a link, although without the stretched screen due to the low resolution that the SNES had and a higher resolution than the Genesis.
Sonic 1 SNES Port(by TiagoSC) New Demo Gameplay + Download