I pinpointed it. What's missing is management. In tournament you feel like your in control because you can manage your actions or fief. In Zombie Exodus you can again manage yourself or your survivors. What's missing in this new IF are the questions of.. how should I spend my day? This means your MC is active instead of reactive. Undying Fortress is abomination of an IF for example. I don't know how it even got an OK for publishing as an IF.
But IF back then are not all that great either. I remember getting baited by first three chapters of goodness then paying for it only to play point and click on the fourth chapter( I'm looking at you choice of rock star)