Removed extraneous enemy_died signal from spawning; used

get_nodes_in_group for enemy_count

enemy.gd

@@ -36,7 +36,7 @@ func _process(delta):
 
 
 func explode():
-    print_debug("Enemy died!")
+    print_debug("Enemy explode!")
     speed = 0
     $AnimationPlayer.play("explode")
     set_deferred("monitoring", false)

event_bus.gd

@@ -4,6 +4,6 @@ extends Node
 
 signal shield_changed(max_value: int, old_value: int, new_value: int)
 signal player_died()
-signal enemy_died()
+signal enemy_died(value: int)
 
 @warning_ignore_restore("unused_signal") # put any future signals you add between the two ignore annotations

main.gd

@@ -3,6 +3,7 @@ extends Node2D
 var enemy = preload("res://enemy.tscn")
 var score = 0
 var playing = false
+var enemy_count: int = 0
 
 @onready var start_button = $CanvasLayer/CenterContainer/Start
 @onready var game_over = $CanvasLayer/CenterContainer/GameOver
@@ -15,20 +16,25 @@ func _ready():
 #   spawn_enemies()
 
 func spawn_enemies():
+
     for x in range(9):
-        for y in range(3):
+      for y in range(3):
             var e = enemy.instantiate()
             var pos = Vector2(x * (16 + 8) + 24, 16 * 4 + y * 16)
             add_child(e)
             e.start(pos)
-            EventBus.enemy_died.emit()
+    enemy_count = get_tree().get_nodes_in_group("enemies").size()
+    print(enemy_count)
 
 
-
-func _on_enemy_died(value):
-    print_debug("Enemy died!")
+func _on_enemy_died(value: int):
     score += value
+    enemy_count -= 1
     $CanvasLayer/UI.update_score(score)
+    print_debug(enemy_count)
+    if enemy_count == 0:
+        print("All enemies defeated!")
+        win_game()
 
 func _on_player_died():
     playing = false
@@ -48,3 +54,10 @@ func new_game():
 func _on_start_pressed():
     start_button.hide()
     new_game()
+
+func win_game():
+    playing = false
+    game_over.show()
+    await get_tree().create_timer(2).timeout
+    game_over.hide()
+    start_button.show()

player.gd

@@ -77,7 +77,7 @@ func _on_gun_cooldown_timeout() -> void:
 func _on_area_entered(area):
     if area.is_in_group("enemies"):
         area.explode()
-        shield -= max_shield / 2
+        shield -= int(max_shield / 2)
         damage_taken.emit()
     if area.is_in_group("enemy_bullets"):
         damage_taken.emit()

ui.gd

@@ -24,8 +24,6 @@ func _on_shield_changed(max_value: int, old_value: int, new_value: int) -> void:
     _on_fx_shield_ui()
 
 
-
-
 func _on_fx_shield_ui():
     shader_active = true
     shield_bar.material.set_shader_parameter("toggle", 1.0)