In theory it can be startet with a mere 020 and 8 MB fastram on PAL / NTSC (that at least what is stated on the packageing of the official clickboom Version) but that would only be a really slow slideshow.
I played it through on a Blizzard1240 @ 40MHz on a Picasso IV back then and it was damn slow (nearly 1 second beween each shot of the nailgun)
Playable it is only on a 060 with GFX-card in 320x240.