This is an unusual mod, with the brand new mechanic. The most part of game you will not be able to touch anything: you'll have to interact with boxes, energy balls etc. using your portals only.
This shouldn't even be listed as a mod, it should be on TWP as a map pack. A horrible map pack. It reminds me of Portal Underground Story, where it's just bad puzzle after bad puzzle, going in a straight line. There's not even a story here. Not even some voice overs. It's just an overly simple series of puzzles.