Metal Gear Solid: Tactical Espionage - PS1
Super Mario 64 - N64
Kill Switch -Dreamcast
Ico - PS2
Shadow of the Colossus - PS2
Halo: Combat Evolved - Xbox
Jak & Daxter - PS2
I think if Ecco the Dolphin 1 and 2 were released in the 2010's, they would be held in the same regard as Journey, Ori and the Blind Forest and other big indy successes. It got lost in the shuffle on the Genesis.