Original Post — Direct link

The game is lacking defensive structures. A few simple structures could add some depth to the game, while preserving it's simplicity.

Watchtower: Unlocked in "Spiritualism" tech tree. It costs 12 stars, and gets defense bonuses when built on forest or mountain tiles.

Limitations: You may build 1 Watchtower per city.

Effect: The Watchtower has a range of 3 tiles, and will shoot a projectile at the highest HP target in range for 3 damage at the end of the belonging player's turn.

If the city the Watchtower belongs to is captured, the Watchtower's ownership is transferred to the new owner of the city.

Watchtowers have 35 HP, and 2 Defense. They get a defense bonus when built on forest/mountain tiles.

External link →
13 days ago - /u/Zoythrus - Direct link

As u/eisthefifthletter_ stated in another comment, the game used to have Guard Towers, but was removed because it was unfun.

The lack of defensive structures is actually intentional, as we don't want the game to be about turtling, as that'd slow things down too much, just like the Guard Towers did long ago.