Wow, I really like the ambience in this one! But, above all, I was very much drawn to how philosophical it can get without being cheesy or tiresome.
The mind really is a powerful thing, for better or (and) worse, and I think this game captured that very well (you guys also mentioned Fahrenheit 451, which is another soft spot of mine that made me love it even more, lol).
Finally, the graphics and soundtrack were perfectly aligned with the storytelling style used and definitely contributed to making this game pretty unique, in a way. Great work!