Well, the game's entire purpose is for you to enter and leave the danger zone as quickly as possible to ensure your danger level doesn't go up too much. Plus, the danger level resets to 0 after a few seconds. If they have no reason ever to enter the danger zone, then, well, there's no challenge to the game.
Not bad, and yes, a danger zone coming from all angles is good, but what's the point of it if the player won't have to ever go inside of it, if the diamonds were to spawn only outside of the danger zone?
