Interesting video. I only ever played the VCS version, so I am surprised how differen the others are. I presume the slides still appear in the other versions, but in later levels?
I think homebrewers today could really do a version for the 2600 that looks very close to the other ones.
I am a bit puzzled as to why the sprites flicker like hell on the japanese computers; and the Apple II version is way too fast.
The GameBoy version looks neat, but with the zoomed in view it is barely worth calling a port, more like another game with similar basic mechanics. Much like the Nintendo-versions of Lode Runner it looks nice, but is a problem for gameplay.