This is one of the most polished, multimedia-confident Twines I have ever come across. Some great graphics, particularly at the end, and a really good, atmospheric soundtrack.
Writing a puzzle game in Twine is potentially a challenge because the options are laid out for the reader already, but a way around that is to have lots of options so that the signal is hidden amongst the noise. I took a few tries on this one, and found a way of exploring every location before making any irreversible errors. Part of me wanted a bit more detail about the world which the PC is living in, the mission, and what has happened - but perhaps it was all the more evocative that these things are only briefly sketched in. It took me several plays before I managed to get to the good ending, and held my attention through all of them. A very accomplished game.