LD56 is over. This is the game.

entities/buildings/ballista.gd

@@ -0,0 +1,22 @@
+class_name Ballista extends Building
+
+
+var target:EnemyAnt
+var arrow_scene := preload("res://entities/buildings/Arrow.tscn")
+
+func _process(delta: float) -> void:
+	if target != null:
+		$pivot.look_at(target.global_position)
+
+func _on_timer_timeout() -> void:
+	if target == null or target.global_position.distance_to(global_position)>50:
+		var target_area := $targetArea as Area3D
+		var targets := target_area.get_overlapping_bodies().filter(
+			func(body:Node3D)->bool: return body is EnemyAnt
+		)
+		if targets.is_empty(): return
+		target = targets.pick_random()
+	var arrow := arrow_scene.instantiate() as Area3D
+	$pivot.add_child(arrow)
+	arrow.rotation.y = PI
+	arrow.global_position = $pivot.global_position + Vector3.UP*0.25