That is indeed very low, there could be several factors.
Comparing with other blog scripts, your preview image does not really give good visual of your product.
As for the search rankings on Codester. An item that is more "popular" will rank higher.
As for getting your product ranked in Google, we highly recommend to get some links to your product. We already rank high for Scripts, app templates etc on our domain. If your script has more links then your competition on Codester it has a good chance to shown on Google.