Added a translation, hopefully its now more readable.
I'm not to keen on the idea, it seems that you are suggesting a game that doesn't take advantage of IDP mechanics, we can force players not to move up a level unless there are no mobs there. Also at the start of the game there would be 100-200 zombies in the immediate area, this could lag many slower machines. This game just seems like a mob arena but with a slight twist, I'm not fond of it, perhaps adjust your idea a little to take full advantage of IDP?