Add basic enemy behavior and spawning system

The changes introduce enemy mechanics and management - including
spawning, movement patterns, shooting timers, and death handling.

scenes/enemy.gd

@@ -0,0 +1,41 @@
+extends Area2D
+
+signal died
+
+var start_pos = Vector2.ZERO
+var speed = 0
+
+@onready var screensize  = get_viewport_rect().size
+
+func start(pos):
+    speed = 0
+    position = Vector2(pos.x, -pos.y)
+    start_pos = pos
+    await get_tree().create_timer(randf_range(0.25, 0.55)).timeout
+    var tween = create_tween().set_trans(Tween.TRANS_BACK)
+    tween.tween_property(self, "position:y", start_pos.y, 1.4)
+    await tween.finished
+    $MoveTimer.wait_time = randf_range(5, 20)
+    $MoveTimer.start()
+    $ShootTimer.wait_time = randf_range(4, 20)
+    $ShootTimer.start()
+
+func _on_timer_timeout():
+    speed = randf_range(75, 100)
+
+func _on_shoot_timer_timeout():
+    $ShootTimer.wait_time = randf_range(4, 20)
+    $ShootTimer.start()
+
+func _process(delta):
+    position.y += speed * delta
+    if position.y > screensize.y + 32:
+      start(start_pos)
+
+func explode():
+    speed = 0
+    $AnimationPlayer.play("explode")
+    set_deferred("monitoring", false)
+    died.emit(5)
+    await $AnimationPlayer.animation_finished
+    queue_free()

scenes/enemy.gd.uid

@@ -0,0 +1 @@
+uid://bgdjbphv28w25

scenes/enemy.tscn

@@ -0,0 +1,164 @@
+[gd_scene load_steps=9 format=3 uid="uid://c4vq2ytntfvoj"]
+
+[ext_resource type="Script" uid="uid://bgdjbphv28w25" path="res://scenes/enemy.gd" id="1_55jtl"]
+[ext_resource type="Texture2D" uid="uid://deyu1prtitqcp" path="res://resources/Mini Pixel Pack 3/Enemies/Bon_Bon (16 x 16).png" id="2_mpr68"]
+[ext_resource type="Texture2D" uid="uid://h04wm5a27u0" path="res://resources/Mini Pixel Pack 3/Effects/Explosion (16 x 16).png" id="3_4ra3w"]
+
+[sub_resource type="RectangleShape2D" id="RectangleShape2D_ft8do"]
+size = Vector2(14, 12)
+
+[sub_resource type="Animation" id="Animation_1vja8"]
+length = 0.001
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath("Sprite2D:texture")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 1,
+"values": [ExtResource("2_mpr68")]
+}
+tracks/1/type = "value"
+tracks/1/imported = false
+tracks/1/enabled = true
+tracks/1/path = NodePath("Sprite2D:hframes")
+tracks/1/interp = 1
+tracks/1/loop_wrap = true
+tracks/1/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 1,
+"values": [4]
+}
+tracks/2/type = "value"
+tracks/2/imported = false
+tracks/2/enabled = true
+tracks/2/path = NodePath("Sprite2D:frame")
+tracks/2/interp = 1
+tracks/2/loop_wrap = true
+tracks/2/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 1,
+"values": [2]
+}
+
+[sub_resource type="Animation" id="Animation_5wwv6"]
+resource_name = "bounce"
+loop_mode = 1
+step = 0.05
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath("Sprite2D:texture")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 1,
+"values": [ExtResource("2_mpr68")]
+}
+tracks/1/type = "value"
+tracks/1/imported = false
+tracks/1/enabled = true
+tracks/1/path = NodePath("Sprite2D:hframes")
+tracks/1/interp = 1
+tracks/1/loop_wrap = true
+tracks/1/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 1,
+"values": [4]
+}
+tracks/2/type = "value"
+tracks/2/imported = false
+tracks/2/enabled = true
+tracks/2/path = NodePath("Sprite2D:frame")
+tracks/2/interp = 1
+tracks/2/loop_wrap = true
+tracks/2/keys = {
+"times": PackedFloat32Array(0.1, 0.2, 0.3, 0.4, 0.45),
+"transitions": PackedFloat32Array(1, 1, 1, 1, 1),
+"update": 1,
+"values": [2, 1, 0, 3, 0]
+}
+
+[sub_resource type="Animation" id="Animation_iwav8"]
+resource_name = "explode"
+length = 0.4
+step = 0.05
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath("Sprite2D:texture")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 1,
+"values": [ExtResource("3_4ra3w")]
+}
+tracks/1/type = "value"
+tracks/1/imported = false
+tracks/1/enabled = true
+tracks/1/path = NodePath("Sprite2D:frame")
+tracks/1/interp = 1
+tracks/1/loop_wrap = true
+tracks/1/keys = {
+"times": PackedFloat32Array(0, 0.042729422, 0.1, 0.15, 0.4),
+"transitions": PackedFloat32Array(1, 1, 1, 1, 1),
+"update": 1,
+"values": [0, 2, 3, 4, 5]
+}
+tracks/2/type = "value"
+tracks/2/imported = false
+tracks/2/enabled = true
+tracks/2/path = NodePath("Sprite2D:hframes")
+tracks/2/interp = 1
+tracks/2/loop_wrap = true
+tracks/2/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 1,
+"values": [6]
+}
+
+[sub_resource type="AnimationLibrary" id="AnimationLibrary_1i2q2"]
+_data = {
+&"RESET": SubResource("Animation_1vja8"),
+&"bounce": SubResource("Animation_5wwv6"),
+&"explode": SubResource("Animation_iwav8")
+}
+
+[node name="Enemy" type="Area2D" groups=["enemies"]]
+script = ExtResource("1_55jtl")
+
+[node name="Sprite2D" type="Sprite2D" parent="."]
+position = Vector2(0, -3)
+texture = ExtResource("2_mpr68")
+hframes = 4
+frame = 2
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="."]
+position = Vector2(0, -3)
+shape = SubResource("RectangleShape2D_ft8do")
+
+[node name="AnimationPlayer" type="AnimationPlayer" parent="."]
+libraries = {
+&"": SubResource("AnimationLibrary_1i2q2")
+}
+autoplay = "bounce"
+
+[node name="MoveTimer" type="Timer" parent="."]
+one_shot = true
+
+[node name="ShootTimer" type="Timer" parent="."]
+one_shot = true
+
+[connection signal="timeout" from="MoveTimer" to="." method="_on_move_timer_timeout"]
+[connection signal="timeout" from="ShootTimer" to="." method="_on_shoot_timer_timeout"]

scenes/game.tscn

@@ -0,0 +1,10 @@
+[gd_scene load_steps=3 format=3 uid="uid://oq85kpt7a853"]
+
+[ext_resource type="PackedScene" uid="uid://ssdtocwmj0wj" path="res://scenes/start.tscn" id="1_yqjtg"]
+[ext_resource type="PackedScene" uid="uid://brutkgnx73onj" path="res://scenes/gameplay.tscn" id="2_lnu2h"]
+
+[node name="Game" type="Node2D"]
+
+[node name="Start" parent="." instance=ExtResource("1_yqjtg")]
+
+[node name="Gameplay" parent="." instance=ExtResource("2_lnu2h")]

scenes/main.gd

@@ -0,0 +1,20 @@
+extends Node2D
+
+
+var enemy = preload("res://scenes/enemy.tscn")
+var score = 0
+
+func _ready():
+    spawn_enemies()
+
+func spawn_enemies():
+    for x in range(9):
+        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)
+            e.died.connect(_on_enemy_died)
+
+func _on_enemy_died(value):
+    score += value

scenes/main.gd.uid

@@ -0,0 +1 @@
+uid://b2tub370i3s3v

scenes/main.tscn

@@ -1,10 +1,64 @@
-[gd_scene load_steps=3 format=3 uid="uid://oq85kpt7a853"]
+[gd_scene load_steps=8 format=3 uid="uid://ce5rw02b3373d"]
 
-[ext_resource type="PackedScene" uid="uid://ssdtocwmj0wj" path="res://scenes/start.tscn" id="1_0wfyh"]
+[ext_resource type="Script" uid="uid://b2tub370i3s3v" path="res://scenes/main.gd" id="1_jyhfs"]
-[ext_resource type="PackedScene" uid="uid://brutkgnx73onj" path="res://scenes/gameplay.tscn" id="2_sugp2"]
+[ext_resource type="Texture2D" uid="uid://jj8b7vqj3ihx" path="res://resources/Mini Pixel Pack 3/Space_BG (2 frames) (64 x 64).png" id="2_tbgi4"]
+[ext_resource type="PackedScene" uid="uid://bkuucjejc7p2v" path="res://scenes/player.tscn" id="3_tefeu"]
+[ext_resource type="PackedScene" uid="uid://c4vq2ytntfvoj" path="res://scenes/enemy.tscn" id="4_o6xl0"]
+
+[sub_resource type="Animation" id="Animation_vcsgt"]
+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_rarhs"]
+resource_name = "scroll"
+length = 2.0
+loop_mode = 1
+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, 2),
+"transitions": PackedFloat32Array(1, 1),
+"update": 0,
+"values": [Rect2(0, 0, 240, 320), Rect2(0, -64, 240, 320)]
+}
+
+[sub_resource type="AnimationLibrary" id="AnimationLibrary_c01mt"]
+_data = {
+&"RESET": SubResource("Animation_vcsgt"),
+&"scroll": SubResource("Animation_rarhs")
+}
 
 [node name="Main" type="Node2D"]
+script = ExtResource("1_jyhfs")
 
-[node name="Start" parent="." instance=ExtResource("1_0wfyh")]
+[node name="Background" type="Sprite2D" parent="."]
+texture_repeat = 2
+texture = ExtResource("2_tbgi4")
+centered = false
+region_enabled = true
+region_rect = Rect2(0, 0, 240, 320)
 
-[node name="Gameplay" parent="." instance=ExtResource("2_sugp2")]
+[node name="Player" parent="." instance=ExtResource("3_tefeu")]
+
+[node name="AnimationPlayer" type="AnimationPlayer" parent="."]
+libraries = {
+&"": SubResource("AnimationLibrary_c01mt")
+}
+autoplay = "scroll"
+
+[node name="Enemy" parent="." instance=ExtResource("4_o6xl0")]

scenes/player.tscn

@@ -1,6 +1,7 @@
-[gd_scene load_steps=14 format=3 uid="uid://bkuucjejc7p2v"]
+[gd_scene load_steps=15 format=3 uid="uid://bkuucjejc7p2v"]
 
 [ext_resource type="Script" uid="uid://c7fe5pl54gkem" path="res://scenes/player.gd" id="1_qlg0r"]
+[ext_resource type="PackedScene" uid="uid://bus77xvomweiu" path="res://scenes/bullet.tscn" id="2_fjrip"]
 [ext_resource type="Texture2D" uid="uid://di2xhcwcdbhxg" path="res://resources/Mini Pixel Pack 3/Player ship/Player_ship (16 x 16).png" id="2_tuyoq"]
 [ext_resource type="Texture2D" uid="uid://ces8fm7lxh574" path="res://resources/Mini Pixel Pack 3/Player ship/Boosters (16 x 16).png" id="3_fjrip"]
 [ext_resource type="Texture2D" uid="uid://bjdhq42ummgky" path="res://resources/Mini Pixel Pack 3/Player ship/Boosters_left (16 x 16).png" id="4_smehm"]
@@ -71,6 +72,7 @@ size = Vector2(14, 14)
 
 [node name="Player" type="Area2D"]
 script = ExtResource("1_qlg0r")
+bullet_scene = ExtResource("2_fjrip")
 
 [node name="Ship" type="Sprite2D" parent="."]
 texture = ExtResource("2_tuyoq")
@@ -87,7 +89,7 @@ autoplay = "forward"
 shape = SubResource("RectangleShape2D_w3w6i")
 
 [node name="GunCooldown" type="Timer" parent="."]
-wait_time = 0.001
+wait_time = 0.24
 one_shot = true
 
 [connection signal="timeout" from="GunCooldown" to="." method="_on_gun_cooldown_timeout"]