You can leave the credits for the original game since it's not yours.
What do you mean I don't have to give any credit you don't own it either
And the company has shut so why do I have to give credit
So You could add a disclaimer stating that the original game isn't yours, because the way the description is written makes it look like you created it—but if you don't want to, that's fine.
And I made the mod so its not yours either
