Yes, 恐竜動物園での海洋探査 is free to download, however it contains in-app purchases or subscription offerings.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
恐竜動物園での海洋探査 has several in-app purchases/subscriptions, the average in-app price is ¥600.00.
To get estimated revenue of 恐竜動物園での海洋探査 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.