Added in background particles.

Materials/Particles/down_particles_bg.tres

@@ -0,0 +1,11 @@
+[gd_resource type="ParticleProcessMaterial" format=3 uid="uid://dhirstigqbwlc"]
+
+[resource]
+particle_flag_disable_z = true
+emission_shape_offset = Vector3(0, -8, 0)
+emission_shape = 1
+emission_sphere_radius = 7.35
+gravity = Vector3(0, -98, 0)
+scale_max = 2.5
+color = Color(0, 0, 0, 0.5137255)
+collision_mode = 2

Materials/Particles/up_particles_bg.tres

@@ -0,0 +1,11 @@
+[gd_resource type="ParticleProcessMaterial" format=3 uid="uid://ch1r4nhrcpg3s"]
+
+[resource]
+particle_flag_disable_z = true
+emission_shape_offset = Vector3(0, -8, 0)
+emission_shape = 1
+emission_sphere_radius = 7.35
+gravity = Vector3(0, 98, 0)
+scale_max = 2.5
+color = Color(0, 0, 0, 0.5058824)
+collision_mode = 2

Scenes/Levels/level_1.tscn

@@ -1,15 +1,15 @@
-[gd_scene load_steps=4 format=4 uid="uid://c6aveiahox475"]
+[gd_scene format=4 uid="uid://c6aveiahox475"]
 
 [ext_resource type="Script" uid="uid://bdoa8j4vedy8" path="res://Scripts/Levels/level_1.gd" id="1_3mqfk"]
 [ext_resource type="TileSet" uid="uid://bxbrytgrtnaie" path="res://Sprites/Tile Sets/main.tres" id="2_iixi8"]
 [ext_resource type="PackedScene" uid="uid://syx6ov00a585" path="res://Scenes/player.tscn" id="3_cyadu"]
 
-[node name="Main" type="Node2D"]
+[node name="Main" type="Node2D" unique_id=1790453106]
 script = ExtResource("1_3mqfk")
 
-[node name="TileMapLayer" type="TileMapLayer" parent="."]
+[node name="TileMapLayer" type="TileMapLayer" parent="." unique_id=1662317524]
 tile_map_data = PackedByteArray("AAABAAwAAAAAAAEAAAACAAwAAAAAAAEAAAADAAwAAAAAAAEAAAAEAAwAAAAAAAEAAAAFAAwAAAAAAAEAAAAGAAwAAAAAAAEAAAAHAAwAAAAAAAEAAAAIAAwAAAAAAAEAAAAJAAwAAAAAAAEAAAAKAAwAAAAAAAEAAAALAAwAAAAAAAEAAAAMAAwAAAAAAAEAAAANAAwAAAAAAAEAAAAOAAwAAAAAAAEAAAAPAAwAAAAAAAEAAAAQAAwAAAAAAAEAAAARAAwAAAAAAAEAAAASAAwAAAAAAAEAAAATAAwAAAAAAAEAAAAUAAwAAAAAAAEAAAAVAAwAAAAAAAEAAAAWAAwAAAAAAAEAAAAXAAwAAAAAAAEAAAAYAAwAAAAAAAEAAAAYAAsAAAACAAAAAAA=")
 tile_set = ExtResource("2_iixi8")
 
-[node name="Player" parent="." instance=ExtResource("3_cyadu")]
+[node name="Player" parent="." unique_id=748235082 instance=ExtResource("3_cyadu")]
 position = Vector2(24, 184)

Scenes/player.tscn

@@ -5,6 +5,7 @@
 [ext_resource type="Material" uid="uid://ck13qte606w1j" path="res://Materials/Particles/down_particles.tres" id="2_vgqql"]
 [ext_resource type="Script" uid="uid://de1fdvk35epdt" path="res://Scripts/player_camera.gd" id="4_vgqql"]
 [ext_resource type="PackedScene" uid="uid://botdddpmgoc8o" path="res://Scenes/scene_transition_rect.tscn" id="5_fkybt"]
+[ext_resource type="Script" uid="uid://cbj4o4syiqn74" path="res://Scripts/background_particles.gd" id="6_x3wgy"]
 
 [sub_resource type="RectangleShape2D" id="RectangleShape2D_jjgbg"]
 size = Vector2(16, 16)
@@ -33,10 +34,15 @@ rect = Rect2(-8, -8, 16, 16)
 top_level = true
 script = ExtResource("4_vgqql")
 
+[node name="BackgroundParticles" type="Node2D" parent="." unique_id=867705320]
+script = ExtResource("6_x3wgy")
+number_of_particles = 250
+
 [node name="SceneTransitionRect" parent="." unique_id=726492614 instance=ExtResource("5_fkybt")]
 offset_left = -5000.0
 offset_top = -5000.0
 offset_right = 5000.0
 offset_bottom = 5000.0
 
+[connection signal="input_event" from="." to="BackgroundParticles" method="_on_player_input_event"]
 [connection signal="screen_exited" from="VisibleOnScreenNotifier2D" to="." method="_on_visible_on_screen_notifier_2d_screen_exited"]

Scripts/background_particles.gd

@@ -0,0 +1,48 @@
+extends Node2D
+
+@export var number_of_particles : int
+
+var particle_child : GPUParticles2D
+var up_material : ParticleProcessMaterial = load("res://Materials/Particles/up_particles_bg.tres")
+var down_material : ParticleProcessMaterial = load("res://Materials/Particles/down_particles_bg.tres")
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	
+	up_material = up_material.duplicate()
+	down_material = down_material.duplicate()
+	reloadParticles()
+	
+func _physics_process(delta: float) -> void:
+	if Input.is_action_just_pressed("flip"):
+		print("input detected")
+		reloadParticles()		
+		
+func reloadParticles() -> void:
+	
+	#If the particle node does not already exist, do the initial setup, and add it as a child node.
+	if !has_node("BGParticles"):
+		var bgparticle := GPUParticles2D.new()
+		bgparticle.amount = number_of_particles
+		bgparticle.emitting = true
+		bgparticle.top_level = true
+		bgparticle.name = "BGParticles"
+		add_child(bgparticle)
+		particle_child = get_node_or_null("BGParticles")
+	
+	#Set up the material we want to set the particle node to, and set up a screen size variable.
+	var material : ParticleProcessMaterial
+	var size : Vector2 = get_viewport_rect().size
+	
+	#Simple gravity direction detection.
+	if al_globals.y_gravity > 0:
+		material = up_material
+	elif al_globals.y_gravity < 0:
+		material = down_material
+	
+	#Set the emission shape and the size, relative to size of screen.
+	material.emission_shape = ParticleProcessMaterial.EMISSION_SHAPE_BOX
+	material.emission_box_extents = Vector3(size.x, size.y, 0)
+	
+	#Set the material of the particle child object to the created material.
+	particle_child.process_material = material

Scripts/background_particles.gd.uid

@@ -0,0 +1 @@
+uid://cbj4o4syiqn74

project.godot

@@ -34,6 +34,7 @@ enabled=PackedStringArray("res://addons/_Godot-IDE_/plugin.cfg")
 
 folder_colors={
 "res://addons/_Godot-IDE_/plugins": "blue",
+"res://addons/_Godot-IDE_/plugins/": "blue",
 "res://addons/_Godot-IDE_/shared_resources/": "teal"
 }