That was very fun and I had a great time trying to survive as long as possible. It's not easy at first but after a while you develop little reflexes and tactics.
The last game I played was pretty frustrating because I managed to last long enough but after a while the people I was touching weren't turning into skeletons, so I was losing skeletons without being able to convert any back.
Also, the crowd of skeletons easily tends to get stuck everywhere, in walls and trees in particular.
Finally, the mini map is welcome but it doesn't seem to update properly and I don't always understand what I see on it.