honestly, this little change will change an important part of the game.
When Giants are attacking the Citadel 99,99% have the same ending. There is no chance to defend the Citadel. The "point of moment" to turn the situation is not realistic. After this point it is too easy to break down the Citadel and is no fun at all.
BUT: It will be possible if.
1.The Healing-Rate of the Crystal is higher when the Citadel is under attack
2. The Citadel does damage!
With these 2 changes it will be much harder to win, and easier to defend the citadel!
So that we need new strategical ways to attack and win