This has bothered me for a long time, and there is no way to contact Google for support, and their documentation doesn\'t cover this.
I think I must be missing something
CWS works strange, I think some unwanted to Google extensions and apps are blocked and are not shown in the top of categories. You can check this by going to the bottom of the categories and see these unwanted apps and extensions. Simple set the filter to 4 stars and you can find this apps in the place when apps and extensions with promotion tales ended.
I've met this issue before and have contacted with the CWS dev support team. It is because chrome web store doesn't list the item under its category if it has already been installed by the user. I can see your extension under "Extensions, Productivity, Runs Offline" category properly since I didn't install your extension. I think Google CWS team is considering to show up the item under its category no matter if the user has installed it in the future.