WBSteroids is a great asteroids clone, and with your system should happily run it with lots of objects and explosions...
There used to be a cool worm/snake game called dieserZug which I enjoyed; not really very challenging or graphically clever, but that's probably why it was so addictive.
ADOM (Ancient Domains of Mystery) is fun, too.
There was another cool one which I used to like that had a random assortment of coloured discs stacked across the screen. You click a group of same-coloured discs, and they disappear making others fall down and shuffle left; you get more points the more discs you clear with a click. No idea what it was called though, I'm afraid!
Regarding WB games that have good graphics, or use Warp3D... I didn't know that there was such a beastie!! :-)
