To my knowledge, it is used by some hobbyists to create games, particularly combined with the ebiten game engine. However, most of the people giving feedback and asking questions keep their games closed source, so I don't have a full overview.
Further, Ark is currently used in four scientific simulation models from the fields of ecology and epidemiology in a professional context.
Further, Ark is currently used in four scientific simulation models from the fields of ecology and epidemiology in a professional context.