Check their twitter, which is listed on this page. They post updates frequently there.
In fact, they say on this very page that development news will go up there.
An update to Project Kat + Chapter 1 (the continuation) are currently in the works, you can find our updates on our twitter here!
Sadly we have full-time occupations and we can only work in our free time, hence the long wait :) Thank you for your patience though!
(and thanks to Benderesco for clarifying!)