There is a touch arcade thread that people occasionally visit, but most of our contact with our users is through email. We're planning to add a direct email link in our "about" page in the game (we already have a link to our website), so hopefully that will make it easier for people to contact us.

(We readily admit that we're pretty bad at forming a community. This is a spare-time thing for both of us, and neither of us uses twitter, facebook, or really any social service, much personally, so we feel a little like fish out of water when it comes to the social aspect of the game. We have a level editor, but no way for people to share levels outside of the game itself, and no way for people to talk about levels they make. We're getting there...)