bunch of fixes based on feedback, adding changelog

ui/Area2D2.gd

@@ -8,6 +8,7 @@ func _ready():
 	var sprite = Sprite.new()
 	sprite.texture = preload('res://ui/button.png')
 	sprite.position = Vector2(32,32)
+	sprite.modulate = get_parent().self_modulate
 	add_child(sprite)
 
 func _on_Area2D2_area_entered(area):