I guess the ramps did go over the playfield, so in that way I guess it was 3d.

I had to look it up: cinematronics called the platform "Full Tilt! Pinball", AKA "Pinball 95" and it came with three tables, space cadet being one of them. But it was not 3d space cadet pinball, it was just space cadet. The one that came on the windows plus for 95 was a shortened version - less content- as well.

Then microsoft licensed it for themselves and merged that name "3d pinball for windows".