Setup UI canvas, added shield and game start.

enemy_bullet.gd

@@ -14,3 +14,4 @@ func _on_visible_on_screen_notifier_2d_screen_exited():
 func _on_area_entered(area):
     if area.name == "Player":
         queue_free()
+        area.shield -= 1

main.gd

@@ -1,9 +1,18 @@
 extends Node2D
 
+@onready var start_button = $CanvasLayer/CenterContainer/Start
+
 var enemy = preload("res://enemy.tscn")
 var score = 0
 
 func _ready():
+    start_button.show()
+#   spawn_enemies()
+
+func new_game():
+    score = 0
+    $CanvasLayer/UI.update_score(score)
+    $Player.start()
     spawn_enemies()
 
 func spawn_enemies():
@@ -17,3 +26,9 @@ func spawn_enemies():
 
 func _on_enemy_died(value):
     score += value
+    $CanvasLayer/UI.update_score(score)
+
+
+func _on_start_pressed():
+    start_button.hide()
+    new_game()

main.tscn

@@ -1,8 +1,25 @@
-[gd_scene load_steps=7 format=3 uid="uid://cc2dnhuv4qx7m"]
+[gd_scene load_steps=9 format=3 uid="uid://cc2dnhuv4qx7m"]
 
 [ext_resource type="Script" uid="uid://c51huloycn5as" path="res://main.gd" id="1_h2yge"]
 [ext_resource type="Texture2D" uid="uid://jj8b7vqj3ihx" path="res://Mini Pixel Pack 3/Space_BG (2 frames) (64 x 64).png" id="1_ig7tw"]
 [ext_resource type="PackedScene" uid="uid://pyuorpwb7lpe" path="res://player.tscn" id="2_0xm2m"]
+[ext_resource type="PackedScene" uid="uid://s6wf3egdqtmh" path="res://ui.tscn" id="4_1bvp3"]
+[ext_resource type="Texture2D" uid="uid://bonoqs5pisflo" path="res://Mini Pixel Pack 3/UI objects/START (48 x 8).png" id="5_lquwl"]
+
+[sub_resource type="Animation" id="Animation_1bvp3"]
+length = 0.001
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath("background:region_rect")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 0,
+"values": [Rect2(0, 0, 240, 320)]
+}
 
 [sub_resource type="Animation" id="Animation_h2yge"]
 resource_name = "scroll"
@@ -21,21 +38,6 @@ tracks/0/keys = {
 "values": [Rect2(0, 0, 240, 320), Rect2(0, -64, 240, 320)]
 }
 
-[sub_resource type="Animation" id="Animation_1bvp3"]
-length = 0.001
-tracks/0/type = "value"
-tracks/0/imported = false
-tracks/0/enabled = true
-tracks/0/path = NodePath("background:region_rect")
-tracks/0/interp = 1
-tracks/0/loop_wrap = true
-tracks/0/keys = {
-"times": PackedFloat32Array(0),
-"transitions": PackedFloat32Array(1),
-"update": 0,
-"values": [Rect2(0, 0, 240, 320)]
-}
-
 [sub_resource type="AnimationLibrary" id="AnimationLibrary_lquwl"]
 _data = {
 &"RESET": SubResource("Animation_1bvp3"),
@@ -60,3 +62,21 @@ libraries = {
 &"": SubResource("AnimationLibrary_lquwl")
 }
 autoplay = "scroll"
+
+[node name="CanvasLayer" type="CanvasLayer" parent="."]
+
+[node name="UI" parent="CanvasLayer" instance=ExtResource("4_1bvp3")]
+
+[node name="CenterContainer" type="CenterContainer" parent="CanvasLayer"]
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="Start" type="TextureButton" parent="CanvasLayer/CenterContainer"]
+layout_mode = 2
+texture_normal = ExtResource("5_lquwl")
+
+[connection signal="shield_changed" from="Player" to="CanvasLayer/UI" method="update_shield"]
+[connection signal="pressed" from="CanvasLayer/CenterContainer/Start" to="." method="_on_start_pressed"]

player.gd

@@ -1,6 +1,12 @@
 extends Area2D
 
+signal died
+signal shield_changed
+
 @onready var screensize = get_viewport_rect().size
+@export var max_shield = 10
+var shield = max_shield:
+    set = set_shield
 @export var speed = 150
 @export var cooldown = 0.25
 @export var bullet_scene : PackedScene
@@ -10,9 +16,17 @@ func _ready():
     start()
 
 func start():
+    shield = max_shield
     position = Vector2(screensize.x / 2, screensize.y - 64)
     $GunCooldown.wait_time = cooldown
 
+func set_shield(value):
+    shield = min(max_shield, value)
+    shield_changed.emit(max_shield, shield)
+    if shield <= 0:
+        hide()
+        died.emit()
+
 func shoot():
     if not can_shoot:
         return
@@ -41,6 +55,10 @@ func _process(delta):
 func _on_gun_cooldown_timeout():
             can_shoot = true
 
-
 func _on_gun_cool_down_timeout() -> void:
   can_shoot = true
+
+func _on_area_entered(area):
+    if area.is_in_group("enemies"):
+        area.explode()
+        shield -= max_shield / 2

player.tscn

@@ -91,4 +91,5 @@ shape = SubResource("RectangleShape2D_op7ga")
 [node name="GunCooldown" type="Timer" parent="."]
 one_shot = true
 
+[connection signal="area_entered" from="." to="." method="_on_area_entered"]
 [connection signal="timeout" from="GunCooldown" to="." method="_on_gun_cool_down_timeout"]

score_counter.gd

@@ -0,0 +1,20 @@
+extends HBoxContainer
+
+var digit_coords = {
+    1: Vector2(0, 0),
+    2: Vector2(8, 0),
+    3: Vector2(16, 0),
+    4: Vector2(24, 0),
+    5: Vector2(32, 0),
+    6: Vector2(0, 8),
+    7: Vector2(8, 8),
+    8: Vector2(16, 8),
+    9: Vector2(24, 8),
+    0: Vector2(32, 8)
+}
+
+func display_digits(n):
+    var s = "%08d" % n
+    for i in 8:
+        get_child(i).texture.region = Rect2(digit_coords[int(s[i])],
+                Vector2(8, 8))

score_counter.gd.uid

@@ -0,0 +1 @@
+uid://val4c82n4krk

score_counter.tscn

@@ -0,0 +1,83 @@
+[gd_scene load_steps=11 format=3 uid="uid://5qkcf1cpre32"]
+
+[ext_resource type="Script" uid="uid://val4c82n4krk" path="res://score_counter.gd" id="1_t7i3n"]
+[ext_resource type="Texture2D" uid="uid://ddh7mk2ekhq3u" path="res://Mini Pixel Pack 3/UI objects/Number_font (8 x 8).png" id="1_terno"]
+
+[sub_resource type="AtlasTexture" id="AtlasTexture_t7i3n"]
+atlas = ExtResource("1_terno")
+region = Rect2(32, 8, 8, 8)
+
+[sub_resource type="AtlasTexture" id="AtlasTexture_knege"]
+atlas = ExtResource("1_terno")
+region = Rect2(32, 8, 8, 8)
+
+[sub_resource type="AtlasTexture" id="AtlasTexture_qa8aw"]
+atlas = ExtResource("1_terno")
+region = Rect2(32, 8, 8, 8)
+
+[sub_resource type="AtlasTexture" id="AtlasTexture_pd82r"]
+atlas = ExtResource("1_terno")
+region = Rect2(32, 8, 8, 8)
+
+[sub_resource type="AtlasTexture" id="AtlasTexture_j44f5"]
+atlas = ExtResource("1_terno")
+region = Rect2(32, 8, 8, 8)
+
+[sub_resource type="AtlasTexture" id="AtlasTexture_emiqc"]
+atlas = ExtResource("1_terno")
+region = Rect2(32, 8, 8, 8)
+
+[sub_resource type="AtlasTexture" id="AtlasTexture_inuy1"]
+atlas = ExtResource("1_terno")
+region = Rect2(32, 8, 8, 8)
+
+[sub_resource type="AtlasTexture" id="AtlasTexture_ke503"]
+atlas = ExtResource("1_terno")
+region = Rect2(32, 8, 8, 8)
+
+[node name="ScoreCounter" type="HBoxContainer"]
+anchors_preset = 10
+anchor_right = 1.0
+grow_horizontal = 2
+size_flags_horizontal = 8
+script = ExtResource("1_t7i3n")
+
+[node name="Digit0" type="TextureRect" parent="."]
+layout_mode = 2
+texture = SubResource("AtlasTexture_t7i3n")
+stretch_mode = 5
+
+[node name="Digit1" type="TextureRect" parent="."]
+layout_mode = 2
+texture = SubResource("AtlasTexture_knege")
+stretch_mode = 5
+
+[node name="Digit2" type="TextureRect" parent="."]
+layout_mode = 2
+texture = SubResource("AtlasTexture_qa8aw")
+stretch_mode = 5
+
+[node name="Digit3" type="TextureRect" parent="."]
+layout_mode = 2
+texture = SubResource("AtlasTexture_pd82r")
+stretch_mode = 5
+
+[node name="Digit4" type="TextureRect" parent="."]
+layout_mode = 2
+texture = SubResource("AtlasTexture_j44f5")
+stretch_mode = 5
+
+[node name="Digit5" type="TextureRect" parent="."]
+layout_mode = 2
+texture = SubResource("AtlasTexture_emiqc")
+stretch_mode = 5
+
+[node name="Digit6" type="TextureRect" parent="."]
+layout_mode = 2
+texture = SubResource("AtlasTexture_inuy1")
+stretch_mode = 5
+
+[node name="Digit7" type="TextureRect" parent="."]
+layout_mode = 2
+texture = SubResource("AtlasTexture_ke503")
+stretch_mode = 5

ui.gd

@@ -0,0 +1,12 @@
+extends MarginContainer
+
+@onready var shield_bar = $HBoxContainer/ShieldBar
+@onready var score_counter = $HBoxContainer/ScoreCounter
+
+func update_score(value):
+    score_counter.display_digits(value)
+
+
+func update_shield(max_value, value):
+    shield_bar.max_value = max_value
+    shield_bar.value = value

ui.gd.uid

@@ -0,0 +1 @@
+uid://b544c65halgk4

ui.tscn

@@ -0,0 +1,34 @@
+[gd_scene load_steps=5 format=3 uid="uid://s6wf3egdqtmh"]
+
+[ext_resource type="Texture2D" uid="uid://d11molrkdjjh5" path="res://bar_background.png" id="1_m6e0p"]
+[ext_resource type="Script" uid="uid://b544c65halgk4" path="res://ui.gd" id="1_nltto"]
+[ext_resource type="Texture2D" uid="uid://bsl3pxvxiuoqg" path="res://bar_foreground.png" id="2_27fn8"]
+[ext_resource type="PackedScene" uid="uid://5qkcf1cpre32" path="res://score_counter.tscn" id="4_ibotj"]
+
+[node name="UI" type="MarginContainer"]
+anchors_preset = 10
+anchor_right = 1.0
+offset_bottom = 20.0
+grow_horizontal = 2
+theme_override_constants/margin_left = 10
+theme_override_constants/margin_top = 10
+theme_override_constants/margin_right = 10
+theme_override_constants/margin_bottom = 10
+script = ExtResource("1_nltto")
+
+[node name="HBoxContainer" type="HBoxContainer" parent="."]
+layout_mode = 2
+
+[node name="ShieldBar" type="TextureProgressBar" parent="HBoxContainer"]
+custom_minimum_size = Vector2(80, 16)
+layout_mode = 2
+nine_patch_stretch = true
+stretch_margin_left = 3
+stretch_margin_top = 3
+stretch_margin_right = 3
+stretch_margin_bottom = 3
+texture_under = ExtResource("1_m6e0p")
+texture_progress = ExtResource("2_27fn8")
+
+[node name="ScoreCounter" parent="HBoxContainer" instance=ExtResource("4_ibotj")]
+layout_mode = 2