Ballista Man - Archer's Fear

The not entirely far-sighted king sent his entire army to the front. But by a tragic coincidence, the city was attacked by crowds of enemies. Fortunately, one warrior remained in the city because he overslept. Now he alone has to protect the city. The king, though stupid, but brave. He will be on the battlefield. By the way, he also needs to be protected.
The mount and blade of our king's sword is broken. All he had left was his shield.
Castle defense, tower defense - the main goal of this game. The siege of the tower continues both in winter and summer.
It's not even a catapult! It's good that you're not an archer and you don't have a bow, but a ballista.
There are 20 levels in total, where more and more powerful opponents will gradually appear.
With only a ballista in your arsenal, you are trying to destroy the advancing enemy.
Gradually improve the ballista and health, you add the rate of fire, the damage dealt by the projectiles, and even the FLAMETHROUER!
In addition, you can purchase special installations with barrels that destroy all enemies in their path when rolling.
The bannerlord of victory will fly over your castle!
Once the enemies destroy the small fence in front of you, or severely damage the king, it's game over.