If your page hasn’t collected any payments, then it can be freely deleted. There is a link on the bottom right section of the game’s edit page (on the opposite side from where the save button on the bottom is)
If it has been purchased or has owners then you can not delete the page. We require you to leave something up for existing owners to learn how to continue to access their purchased product, or an explanation of what happened. You are free to put whatever you want up on that page, hide it, remove files, but you can not delete it entirely. If, for some reason, you still need to delete the page, you can contact support with the request and an explanation why.
Hope that helps