I loved this entry. Bruce has built a machine with no instructions and you have to figure out how to make it work. Being a fan of the Myst series, this is very much the type of puzzle I like. Initially, the whole thing is confusing and strange, but as you work it out everything falls into place and it feels fairly obvious - which is how these type of puzzles work best.
The map has a huge sense of scale - which looks and feels impressive as you solve a puzzle and watch the various parts move into place. However, this is both a blessing and a curse, as that sense of scale also means that the map is just a little bit too big and you spend a lot of time walking between areas and waiting for things to finish moving. This is a very minor issue, however.
The script work is very impressive, and the theme and atmosphere are excellent. I would love to see more maps (and mods) like this!