Nice!!! It is always great seeing more tools for domainers coming out!!
@doctor-ray - maybe add some text also to your signature? .. so our members keep seeing a reminder that this is a domain valuation tool?

just a suggestion, of course!
another suggestion.. if these help, of course.. if don't - just ignore these and continue developing
your website isn't indexed by Google:
.. creating all the possible social media accounts with links back to your site + footer links to these social media accounts will help a little

.. also, general Terms of Service, and company/individual behind this in the footer would help (just adds more credibility.
I wouldn't be so keen using Google Analytics and Google Webmaster Tools (or, whatever is the name today) on it > Google is banned in China and enabling these products will negatively impact loading speeds for Chinese visitors. This is one of the reasons why we don't have these enabled in any of our forums (at least, it should be so). The same applies to using Google fonts - go for the self-hosted fonts only.
Don't give up and keep developing and promoting (you are most welcome to use all our forums for building some backlinks and awareness to tld.is).
All the success!!!
Helmuts