OK, so I had a lot but I figured them all out bar 2.
1 I only remember playing on a PS1 demo, and one of the later demos if my memory serves me correctly. Basically it was a 3rd person kinda thing and you played as a spider/crab style robot and I'm not sure what the objective was but I just remember walking around a pale, white/grey boatyard style area I think (no boats or water, just that import dock kind of environment). There were other similar robots that I'm pretty sure shot the SHIT out of me, and there may have even been humans in black combat uniforms (but that could be a completely different game). I THINK it was on the same demo as the Spice Girls: Spice World game :')
Second was a racing game on Sega Megadrive. It was I think from the early 90s and there were 4 types of car available (I can't tell you exactly the stats of the cars, only that on a selection screen they were lined up side by side and you could choose from a palette of basic colours). I can't remember much about the actually gameplay, only that one of the songs playing was a sort of 8-bit fuzzy guitar version of Black Sabbath - Paranoia (and this song was played throughout the opening credits). Also, it was set in space. There were multiple planets with different race tracks and MAYBE even bosses that you could "buy" the planets off.
Anyone gets these and I'll love you so much