Yes I agree, this has been on my mind as well. I love going to the arcade to see what cool games others have submitted, but end up seeing a clutter of incomplete games that are not in the "Example games" section. I think a simple fix is a checkbox on upload to flag if a game is only for test/show (for community input for example). These games cannot be rated (because they are a WIP), and have their own section of the arcade.