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Missing game, broken link, wrong category, or a removal request. It all lands in the same place and is read by a person.
If you made one of these games
Every game listed here stays on your own site, keeps its own traffic, and is linked directly. Nothing is rehosted or copied. If you would rather your game was not listed, or you want it linked but not shown in a window on this site, say so and it will be changed. No justification needed.
The same goes for the small preview images: they are screenshots of the public page, used to show visitors what they are about to open. Ask and yours comes down.