Anything about the site, your account, your data or a game: write and you'll get an answer. This is a one-person project, so replies take what they take, but they arrive.
privacy@hypercasualgaming.com — privacy, legal matters, account problems or anything else. Add your username if you have one.
To report a game, a profile or a photo, use the report button on the site itself: it goes straight to the review queue and it's the fastest way.
To upload games, ask for a creator account and read the publishing rules and the SDK guide first.