First (and I hope last) commit

Playground.gd

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+extends Node2D
+
+var score = -1 # pop counter; will be set to 0 in "_ready()"
+var screen_size # screen size lol
+var current_music # index 1..7 of AudioStreamPlayer ("MusicN") nodes
+var random = RandomNumberGenerator.new() # randomizer
+var balloon_scene = load("res://Balloon.tscn") # scene with balloon
+var offset_y = 280 # top coordinate under bottom edge of playground to spawn balloons
+
+# Get random music index except current one
+func get_music_idx():
+	var new_current_music = random.randi_range(1, 7)
+	# if random equals to current -- regenerate
+	if new_current_music == current_music:
+		new_current_music == get_music_idx()
+	return new_current_music
+
+# Play next random music
+func play_music():
+	current_music = get_music_idx()
+	get_node('Music' + str(current_music)).play()
+	print("Music started: ", current_music)
+
+# Initialize scene
+func _init():
+	random.randomize()
+
+# When node tree has been created and initialized
+func _ready():
+	screen_size = get_viewport_rect().size # needed to seed balloons
+	update_score() # set 0 in global pop counter
+	play_music() # play random music
+	$TextureRect.set_position(Vector2(0, 0))
+	$TextureRect.rect_size.x = screen_size.x
+	$TextureRect.rect_size.y = screen_size.y
+	# the "finished" signal of every MusicN must start another music
+	for i in range(1, 7):
+		get_node('Music' + str(i)).connect('finished', self, 'play_music')
+
+# On every Timer's interval we add new ballon under
+# the bottom edge of the playground (screen) and
+# randomly flip it horizontally 
+func _on_Timer_timeout():
+	# create new balloon virtually
+	var balloon = balloon_scene.instance()
+	# calculate new horizontal position
+	var x = rand_range(10, screen_size.x - 10)
+	# calculate balloon's scaled height
+	# set new position to balloon under the playground (screen)
+	balloon.set_position(Vector2(x, screen_size.y + offset_y))
+	# randomly flip balloon horizontally
+	# '0' child is AnimatedSprite of Balloon scene 
+	balloon.get_child(0).flip_h = bool(random.randi_range(0, 1))
+	balloon.z_index = 10 # place balloon over other objects
+	add_child(balloon) # place balloon on playground
+
+# Receive "pop" signal from Balloon scene to increment global score counter
+func update_score():
+	score += 1 # increment
+	$Label.text = str(score) # show