Apparently, new levels get unlocked on a weekly basis.
As for getting no reply for reported bug issues, you do realise they are probably dealing with hundreds, if not thousands of emails per day? Many of which will be repeat reports of the same bug, over and over again. Perhaps they could have an auto-reply email service to say thanks, but I wouldnt expect a personal thank you...
What they could/should do is build a database so we can check if a certain bug has been reported, before sending any off to them.
I love what I've seen so far, cant wait for the full game.