I got this game free in my Xbox live membership. I decided to play it as soon as I downloaded given that: it is short and the has a interesting story.
Well indeed, the story is great, the dialogue between Eva and TOM are great, very smart and well thought.
The game is Portal style, very challenging but never frustrating, perhaps a few times. The game has 7 chapters and very easy to get all the achievement. Have of them are gotten following the story and the other half are gotten by just making a special section in every chapters, just be aware that in around half of each chapter there is a path between two sections that lead you to a special puzzle.
The dialogue between the protagonist and the puzzles are very refreshing. I need to play a game like this for a change. Really rewarding and only took around 6 hours to be beating. I like everything about his game.
Recommended to everyone.