Criticized a game like this is hard, because it is a tribute to a tragedy and the goal is only to tell that history, as such, it relays in as simple of a gameplay as you can get (A walking simulator), so don't expect anything groundbreaking gameplay wise, but what you can get is a really beautiful humanization of the people that the world lost on March 11, 2011. Give it a try, it is 15 minutes long and free.