Hi Ren,
Yes, it is definitely a strange game to play. My advice is to take your
time, look everywhere as you go, and pay attention to the signs dotted
around as they give some clues on how to proceed. Some puzzles require
you to pay attention to particular things, for instance the all-seeing
eye symbols on some walls. Other puzzles will only be solved if you go
slow. There are a few devices you'll pick up during the game that will
be required to complete many of the puzzles later on. I'm about halfway
through the game now - definitely a brain-strainer to stand alongside
the Portal games. :)
Alan