Система перехода между сценами. И главное меню. Типа.

scenes/Startup.tscn

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+[gd_scene load_steps=6 format=3 uid="uid://b6nskaaaroy2j"]
+
+[ext_resource type="Script" path="res://scripts/Startup.cs" id="1_1ndxq"]
+[ext_resource type="Texture2D" uid="uid://82rj0mblksli" path="res://resources/sprites/ui/menu.png" id="1_nye7c"]
+[ext_resource type="FontFile" uid="uid://dwn20pw40jpxm" path="res://fonts/ZxSpectrum7-nROZ0.ttf" id="2_et3ev"]
+[ext_resource type="AudioStream" uid="uid://be35iuapayv0u" path="res://resources/music/Day1.wav" id="3_m8gkt"]
+
+[sub_resource type="AudioStreamPlaylist" id="AudioStreamPlaylist_5mfcs"]
+stream_count = 1
+stream_0 = ExtResource("3_m8gkt")
+
+[node name="Startup" type="Node2D"]
+script = ExtResource("1_1ndxq")
+
+[node name="Camera2D" type="Camera2D" parent="."]
+zoom = Vector2(2, 2)
+
+[node name="Sprite2D" type="Sprite2D" parent="."]
+texture = ExtResource("1_nye7c")
+
+[node name="Label" type="Label" parent="."]
+anchors_preset = 8
+anchor_left = 0.5
+anchor_top = 0.5
+anchor_right = 0.5
+anchor_bottom = 0.5
+offset_left = -128.0
+offset_top = 97.0
+offset_right = 128.0
+offset_bottom = 120.0
+grow_horizontal = 2
+grow_vertical = 2
+theme_override_fonts/font = ExtResource("2_et3ev")
+theme_override_font_sizes/font_size = 20
+text = "Press E to start"
+
+[node name="ColorRect" type="ColorRect" parent="."]
+offset_left = -160.0
+offset_top = -120.0
+offset_right = 160.0
+offset_bottom = 120.0
+color = Color(0, 0, 0, 0)
+
+[node name="AudioStreamPlayer" type="AudioStreamPlayer" parent="."]
+stream = SubResource("AudioStreamPlaylist_5mfcs")
+autoplay = true
+bus = &"Music"