think textured cubes on a flat matrix with enemies that approach you when you get so close, also you can make simple maps by using pre made plug together tunnel sections, then add in powerups and simple scenery (drums, boxs etc), it`s not very good as far as results are concerned, you can add an intro and outro screen too iirc, the lack of a demo tells you all you need to know, my description actualy makes it sound better than it is.
Mentor.
PC1: P4 3ghz, 1gig mem, 3x160gig hd`s, Radeon 9800pro w cooler (3rd gfx card), 6 way speakers.
PC2: AMD 2ghz, 512mb ram, FX5200 ultra, 16 bit SB.
Mini ATX cases suck.