Massive kudos in getting something up, running, and available for people to use - I'm sure you'll learn a lot. One thing you'll learn is that the core product is about 10% of the whole experience.

As others have mentioned, if you take it down you should have a place-holder so that people know it will be back, and so it doesn't overly hurt your search engine rankings.

I don't have any feedback on the app since it is offline at the moment, but you have a great attitude in response to criticism!