adj: projectile physics when moving backwards

weapons/rocket_swarm.gd

@@ -165,14 +165,13 @@ func _spawn_custom_projectile(origin: Vector3, fire_dir: Vector3) -> void:
 	# Logic
 	proj.weapon_source = self
 	proj.turn_speed = 6.5 # Slower turn radius so they sweep nicely
-	
 	proj.position = origin # Start at origin to spread outward around camera
 	proj.logical_source = origin
 	
 	# Initial pop-up speed
 	proj.velocity = fire_dir * 5.0
 	if player:
-		proj.velocity += fire_dir * player.velocity.dot(fire_dir)
+		proj.velocity += fire_dir * max(0.0, player.velocity.dot(fire_dir))
 		
 	proj.initial_aim_dir = _current_aim_dir
 	proj.cruise_speed = 65.0