Overall one of the better puzzle games I've played, but it definitely gets too hard in the later half.

Pros:
- Intriguing story that kept me interested enough to want to find out what was going on
- The journal kept track of the story and often gives hints for what to do next
- For the first half the puzzles fairly well balanced, feeling neither too easy nor too difficult
- Being able to use the map for fast travel was very useful

Cons:
- While it's fairly manageable in the first half or so of the game, it gets too hard. I ended up using a walkthrough fairly often for the second half.
- Some of the puzzles weren't simply difficult, but made very little sense even when you look up the solution, which is just frustrating.
- Why can you only fast travel to some rooms on the map? I don't see why it wouldn't let you fast travel to any unlocked room.
- Achievements don't unlock until you exit the game
- Does anyone actually know how to pronounce 'Goetia'? :P

Verdict: 7/10