added a basic ball that properly inverts velocity when colliding with a world boundary. my balls are getting stuck on each other tho

balls/bal433B.tmp

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+[gd_scene load_steps=2 format=3 uid="uid://d2r0ip6xy3a2"]
+
+[ext_resource type="Script" path="res://balls/ball.gd" id="1_ija2k"]
+
+[node name="Ball" type="CharacterBody2D"]
+motion_mode = 1
+floor_stop_on_slope = false
+script = ExtResource("1_ija2k")

balls/ball.gd

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+extends CharacterBody2D
+
+@export var speed: float = 5
+const _speed_mult: float = 200
+var _direction: Vector2 = Vector2(1.0, 0.5)
+
+func _physics_process(delta):
+	velocity.x = speed * _speed_mult * _direction.x
+	velocity.y = speed * _speed_mult * _direction.y
+
+	move_and_slide()
+
+func invert_x():
+	_direction.x *= -1
+
+func invert_y():
+	_direction.y *= -1

balls/ball.tscn

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+[gd_scene load_steps=2 format=3 uid="uid://d2r0ip6xy3a2"]
+
+[ext_resource type="Script" path="res://balls/ball.gd" id="1_ija2k"]
+
+[node name="Ball" type="CharacterBody2D"]
+motion_mode = 1
+floor_stop_on_slope = false
+script = ExtResource("1_ija2k")

balls/basic/ball_basic.tscn

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+[gd_scene load_steps=4 format=3 uid="uid://sl3jbnopo0yh"]
+
+[ext_resource type="PackedScene" uid="uid://d2r0ip6xy3a2" path="res://balls/ball.tscn" id="1_ffml1"]
+[ext_resource type="Texture2D" uid="uid://cxi0fqy5sajh5" path="res://balls/basic/basic.webp" id="2_4dnuc"]
+
+[sub_resource type="RectangleShape2D" id="RectangleShape2D_isusp"]
+size = Vector2(50, 50)
+
+[node name="Ball" instance=ExtResource("1_ffml1")]
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="." index="0"]
+shape = SubResource("RectangleShape2D_isusp")
+
+[node name="Sprite2D" type="Sprite2D" parent="." index="1"]
+texture = ExtResource("2_4dnuc")

balls/basic/basic.webp.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://cxi0fqy5sajh5"
+path="res://.godot/imported/basic.webp-a129d05a6653f0c702726e8f6c206488.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://balls/basic/basic.webp"
+dest_files=["res://.godot/imported/basic.webp-a129d05a6653f0c702726e8f6c206488.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1