Ranger X for Genesis. It is danged hard (I've never made it past the third level) and very lush graphics for 1993.
And Evo: Search For Eden for SNES. The most unique game I've ever played. Seriously, reviews won't do it justice, and if you're into emulation, you need to play this game. It is important to point out that this was developed by Enix.
http://www.rpgclassics.com/shrines/snes/evo/index.shtml