This review is based on 8 hours of play investigating 2 of 10 chapters, and reviewing all of the multimedia content.
If you ever wanted to be in an episode of X-files, either as sceptic or believing investigator, Cloud Chamber is for you. I learned something about astrophysics, too.
You get a case with paranormal indications, presented in the most confusing way possible, through over an hour of self-produced footage split into over 30 clips, almost another hour of material mostly taken from ESA
(another 30 clips), and 120 documents to read and view . This is all organized in connected nodes set in a 3D-landscape, which restricts the order in which you can view all of this material (unless you know how to operate explorer and have an image viewer and a mp4 player such as VLC). Attached to each node is also a discussion board, where you can comment on the material and rate other players' comments, and if enough people like (or dislike) your comments, you can then access a "restricted" node on each of the 10 levels.
I scrutinize everything and look stuff up on the web on my own, so it is surprising that reading the comments still does give me new insights. The temptation to just leave the shackles of the 3D navigation system and just read all of the content directly is always there: it is so much more convenient if you want to view or freeze-frame a certain clip to be able to choose it directly from my playlist than to take the time to navigate the game interface. Given that the premise of the game is that suppressed information is being made public through the underground, one wonders why it isn't more easily accessible. If Wikileaks had operated that way, it would have faded into obscurity rather quickly.
That said, I'd rate the material as "advanced amateur production"; while the acting is good and the makers got access to some amazing locations, including a big anechoic chamber and the roof of the Radisson in Copenhagen, the distortion effects permeating the game are more aesthetic than realistic, which is difficult to disbelieve in a game that encourages you to investigate the smallest minutiae in the material. Given the low price of the game, that is still quite ok with me, actually.
Note that the ending is open: some mysteries are resolved, others are not.
I don't regret the purchase; if you like good amateur productions and don't mind navigating an interface and aesthetics that are more stylish than functional, and would like to fictionally investigate the paranormal (using the social features is optional), I recommend this game to you as well.