[scheeseman486]

The most impressive engine released retail on Saturn was Slavedriver, which was developed by Lobotomy for Powerslave and re-used for ports of Duke Nukem 3D and Quake.

If counting homebrew though, there's this demo which clearly developed by some kind of magician: https://www.youtube.com/watch?v=WpcjkDDLoXM

[Grazester]

The salve driver engine was very good. And that homebrew engine is also a impressive feat. I have been following that guys work for a while

[tuna74]

I would claim Burning Rangers is the most impressive game on the Saturn. The effects are crazy and use the Saturn HW in totally creative ways.

[throwaway128128]

IMO the games which flexed VDP2 were the most impressive since you could do crazy raster effects without dropping the frame rate one iota. Equivalent effects on the Playstation, if even possible, came at a cost of GSU fillrate.