To think such a confined space could open itself up to so many possibilities short-term and long-term alike. 5th Cell have no doubt tapped into the art of stewing over relatively straightforward turn-taking, but its that dread of letting loose that desired buff or helpful aid where the push-and-pull attraction of Castlehold really takes hold.
Source: N4G PC Simplicity Breeds Tactical Complexity in 5th Cell's Castlehold | Hardcore Gamer