level now detects (in a very rudimentary way, by checking every frame) whether all blocks have been broken

scenes/level.tscn

@@ -1,9 +1,9 @@
 [gd_scene load_steps=11 format=3 uid="uid://bmscox3qtwvs2"]
 
+[ext_resource type="Script" path="res://scenes/level.gd" id="1_3qps3"]
 [ext_resource type="Texture2D" uid="uid://c7wvhwsys1ll4" path="res://resources/backgrounds/levelbg.webp" id="1_7ct6t"]
 [ext_resource type="FontFile" uid="uid://dxgnofummhosw" path="res://fonts/play_bold.ttf" id="2_musvo"]
 [ext_resource type="PackedScene" uid="uid://sl3jbnopo0yh" path="res://balls/basic/ball_basic.tscn" id="3_14yi2"]
-[ext_resource type="Script" path="res://scenes/world_boundary.gd" id="3_w4mye"]
 [ext_resource type="PackedScene" uid="uid://cbygje4vi2rkv" path="res://boundaries/world_boundary.tscn" id="4_455ct"]
 [ext_resource type="PackedScene" uid="uid://c1i1fp3xbp6ly" path="res://blocks/block.tscn" id="7_7fnx3"]
 
@@ -23,6 +23,7 @@ normal = Vector2(-1, 0)
 distance = -750.0
 
 [node name="Level" type="Node2D"]
+script = ExtResource("1_3qps3")
 
 [node name="Camera2D" type="Camera2D" parent="."]
 position = Vector2(960, 540)
@@ -52,13 +53,18 @@ theme_override_font_sizes/font_size = 64
 text = "BREAKOUT"
 horizontal_alignment = 1
 
+[node name="Button" type="Button" parent="GUI"]
+layout_mode = 2
+theme_override_fonts/font = ExtResource("2_musvo")
+theme_override_font_sizes/font_size = 50
+text = "ADD BALL"
+
 [node name="GameContent" type="Node2D" parent="."]
 
 [node name="WorldBoundary" type="StaticBody2D" parent="GameContent"]
 position = Vector2(1140, 540)
 collision_layer = 2
 collision_mask = 4
-script = ExtResource("3_w4mye")
 
 [node name="Top" parent="GameContent/WorldBoundary" instance=ExtResource("4_455ct")]
 shape = SubResource("WorldBoundaryShape2D_ybmo2")
@@ -118,3 +124,8 @@ position = Vector2(1603, 907)
 
 [node name="Block12" parent="GameContent/Blocks" instance=ExtResource("7_7fnx3")]
 position = Vector2(1635, 293)
+
+[node name="BallSpawn" type="Node2D" parent="GameContent"]
+position = Vector2(1140, 540)
+
+[connection signal="pressed" from="GUI/Button" to="." method="_on_button_pressed"]