It was fun when it wasn't frustrating.

Good parts are, the whole atmosphere is well done, visuals, music, ambients set the mood nicely. But that's where good ends.

The story makes no sense, neither during the play, nor when you finish it. It has three parts which mix worse than water and oil slapped together.

Puzzles are more annoying than fun. There are four kinds of them.
1) Flip the rectangular board of different size from one state to another by clicking every cell which flips all adjacent ones. It's annoying because it's used repeatedly (10 times or so), most of them are HUGE (we're talking even 10x10 huge), and they flip SLOWLY.
2) Puzzles which rely on seemingly intentionally vague audio/visual clues (repeat a sequence of 10 notes of almost identical pitch which you could only figure out with a perfect ear or a spectrum analyzer on an audio capture, or a looped sequence of lines where you are not shown where the start is).
3) Puzzles which look so out of place you are just flabbergasted.
4) A handful of puzzles which fit the setting, but are still rather funky.

And on top of that, you have to walk, walk, walk, walk, walk, between two furthest points on the map, then retrace your steps back all the way, and then... Go to the furthest point and back once more. And that's just in one of the quests. (Yes, you literally have to go to point A, then are told you need to go to the point B which is the furthest from it to do stuff, then return to A to report, only to learn you need to go to B again to be given a key to do more stuff at B and return to A to report once more.) All the others are little better.