... is that it leaves reviewers flummoxed for things to say.
Both professional reviews for Date Warp so far have come out saying little more about the game than what's on the game's official webpage. As anyone who's played the demo can tell you, there's more than one 'surprise' moment within the demo itself, and obviously more to come as the game goes on.
But if all you can say is "Nothing is as it seems", that's not a very helpful review for a player wanting to know if she should pick it up, is it?
The opening video itself, as these things generally do, contains some spoilers. But if you don't tease people with hints of what's to come, how are they supposed to get interested? :)