Hmmm... I've forgotten which was that megademo which had few games at the end (or by booting from disk 2). One of the games was some sort of gravity force clone, but just going upwards. Gfx felt very good at that time, early 90s.
I think it was two disks and the demo part might have some interactive part too? Some vector gfx/cube over height grid or so (female body type)?
I'd like to check it out again if someone knows the name