Updated damage signal to player.

enemy_bullet.gd

@@ -1,7 +1,9 @@
 extends Area2D
 
+
+
+
 @export var speed = 150
-var shader_active = false
 
 func start(pos):
     position = pos
@@ -15,8 +17,4 @@ func _on_visible_on_screen_notifier_2d_screen_exited():
 func _on_area_entered(area):
     if area.name == "Player":
         queue_free()
-        shader_active = true
-        $Player.ship.material.set_shader_param("toggle", 1.0)
-        shader_active = false
-        $Player.ship.material.set_shader_param("toggle", 0.0)
         area.shield -= 1

enemy_bullet.tscn

@@ -6,7 +6,7 @@
 [sub_resource type="RectangleShape2D" id="RectangleShape2D_gl7bs"]
 size = Vector2(6, 6)
 
-[node name="EnemyBullet" type="Area2D"]
+[node name="EnemyBullet" type="Area2D" groups=["enemy_bullets"]]
 script = ExtResource("1_gl7bs")
 
 [node name="Sprite2D" type="Sprite2D" parent="."]

player.gd

@@ -2,6 +2,9 @@ extends Area2D
 
 signal died
 signal shield_changed
+signal damage_taken
+
+var shader_active = false
 
 @onready var screensize = get_viewport_rect().size
 @export var max_shield = 10
@@ -63,3 +66,13 @@ func _on_area_entered(area):
     if area.is_in_group("enemies"):
         area.explode()
         shield -= max_shield / 2
+    if area.is_in_group("enemy_bullets"):
+        damage_taken.emit()
+
+
+func _on_damage_taken() -> void:
+  shader_active = true
+  $Ship.material.set_shader_parameter("toggle", 1.0)
+  await get_tree().create_timer(1).timeout
+  shader_active = false
+  $Ship.material.set_shader_parameter("toggle", 0.0)

player.tscn

@@ -99,4 +99,5 @@ shape = SubResource("RectangleShape2D_op7ga")
 one_shot = true
 
 [connection signal="area_entered" from="." to="." method="_on_area_entered"]
+[connection signal="damage_taken" from="." to="." method="_on_damage_taken"]
 [connection signal="timeout" from="GunCooldown" to="." method="_on_gun_cool_down_timeout"]