The lack of contact details or any details (terms of service, privacy, etc.) makes me a bit wary about trying the service. While I can appreciate that you want to keep the app clean and easy to use, some basic information (maybe a tutorial video) will bring you a long way. I don't see any information on pricing either. If you are giving it away for free, that's great, but there should be information that this indeed is the case, or that it's easy to export my bills in the case that you run out of money funding an app that doesn't generate cash.
P.S. your demo account took me all of 2 tries to guess the password, so you might want to change that. I'd email you if there were any contact details on your page.