create rolling fiend

graphics/enemy/roller_fiend.png.import

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+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/roller_fiend.png-2f4ff517749815b6378d9070bb47d63f.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://graphics/enemy/roller_fiend.png"
+dest_files=[ "res://.import/roller_fiend.png-2f4ff517749815b6378d9070bb47d63f.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=false
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+process/normal_map_invert_y=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0

objects/enemy/rolling_fiend.gd

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+extends "res://objects/enemy/enemy.gd"
+
+export var move_speed: float = 0.0
+
+var move_dir: Vector2 = Vector2(-1.0, 0.0)
+
+onready var casts = $Raycasts
+onready var wall_cast = $Raycasts/WallCast
+onready var floor_cast = $Raycasts/FloorCast
+
+func _physics_process(delta):
+	position += move_dir * move_speed * delta
+	
+	var rotation_change = -1.5708
+	if not floor_cast.is_colliding():
+		casts.rotation += rotation_change
+		position -= move_dir
+		move_dir = move_dir.rotated(rotation_change)
+		position += move_dir
+	elif wall_cast.is_colliding():
+		casts.rotation -= rotation_change
+		move_dir = move_dir.rotated(-rotation_change)

objects/enemy/rolling_fiend.tscn

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+[gd_scene load_steps=8 format=2]
+
+[ext_resource path="res://objects/enemy/enemy.tscn" type="PackedScene" id=1]
+[ext_resource path="res://graphics/enemy/roller_fiend.png" type="Texture" id=2]
+[ext_resource path="res://objects/enemy/rolling_fiend.gd" type="Script" id=3]
+
+[sub_resource type="AtlasTexture" id=1]
+atlas = ExtResource( 2 )
+region = Rect2( 0, 0, 16, 16 )
+
+[sub_resource type="AtlasTexture" id=2]
+atlas = ExtResource( 2 )
+region = Rect2( 16, 0, 16, 16 )
+
+[sub_resource type="SpriteFrames" id=3]
+animations = [ {
+"frames": [ SubResource( 1 ), SubResource( 2 ) ],
+"loop": true,
+"name": "default",
+"speed": 10.0
+} ]
+
+[sub_resource type="RectangleShape2D" id=4]
+extents = Vector2( 4, 4 )
+
+[node name="RollingFiend" instance=ExtResource( 1 )]
+script = ExtResource( 3 )
+move_speed = 50.0
+
+[node name="AnimatedSprite" type="AnimatedSprite" parent="." index="0"]
+frames = SubResource( 3 )
+frame = 1
+playing = true
+
+[node name="Hitbox" type="Area2D" parent="." index="1"]
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="Hitbox" index="0"]
+rotation = -0.020475
+shape = SubResource( 4 )
+
+[node name="Raycasts" type="Node2D" parent="." index="2"]
+
+[node name="WallCast" type="RayCast2D" parent="Raycasts" index="0"]
+position = Vector2( -8, 8 )
+enabled = true
+cast_to = Vector2( 0, -16 )
+
+[node name="FloorCast" type="RayCast2D" parent="Raycasts" index="1"]
+position = Vector2( -8, 9 )
+enabled = true
+cast_to = Vector2( 16, 0 )
+
+[connection signal="area_entered" from="Hitbox" to="." method="_on_Area2D_area_entered"]