SU's artstyle was an attempt to make Rebecca Sugar's artstyle look simplified and cute for the sake of easier animation and merchandising. Neocosmos is a comic, which shouldn't have necessitated a watered down artstyle. We are seeing a double watering down. An incestuous development.
Their whole style is equivalent to people who draw manga with that flounder side-mouth thing. They based their style on what they saw on TV, not real life.