Understood, thank you!
If I may make a recommendation, I think the explanation you gave in this reply was totally clear to me, and it might be more easy to understand in English if you add the same explanation to the game description. Of course, this is only my personal impression as an English speaker, but the current description sounds like a separate purchase is required to receive each update after the game is purchased as a single item here, which might be concerning to some users.
There's no problem at all and I'm grateful for the clarification, I just wanted to let you know and make this suggestion in case it's helpful since I saw you were using machine translation.