I will try to explain the best I can, english is not my first language.
I don't know why but this game made me feel like a child again: the music, the animation, the atmosphere, everything... I am battling depression and anxiety for years and I have not felt such pure and simple joy and wonder in anything, let alone a game, for a very long time. Again, I can't explain why, but this game brings me memory of my youth, when everything was simpler and lighter. These feelings were so powerfull that I cried. It might be my depression, but the feelings are true.
Anyway, from a more objective point of view, the game is really well made, beautiful. The puzzles are very interesting and the game never gets boring. Some people might say the game is short. I prefer quality over quantity , the game has the exact length so it is not repetitive.