"It would all be down to seven rectangles with very different relationships to gravity."
A game, I think, about perspective, different personalities, and carrying your friends forward. A game about how your weakness, among friends, can become your strength.
Superb narration. Fitting music that isn't too intrusive or repetitive (though there is a bug, I think if you use scenario select the main menu music may loop over the level's music).
The game takes around 4-5 hours to finish, not including DLC which I expect would take one additional hour.
Puzzles aren't too hard, I never got stuck on any for longer than 5-10 minutes. But this isn't really a game about mindbendingly difficult puzzles, it's more about the characters that solve them, and how the characters and the levels themselves are, at times, a visual metaphor for events and emotions in the story.
A cohesive experience. Uplifting and heartwarming, with a charming sense of humor.