I love the simplicity of the UI. It's distraction-free. However, I've already encountered an error. After spending time entering all the details, I get a "client-side error" page once I completed all the steps. So I had to go through the whole process again for my first to-do.

Also, I've added a dependency on my to-do. However, when I click on the "i" icon for more information about my to-do, I don't see the dependency to remind me that I need to finish that dependency in order to complete my to-do item. I was under the impression that the dependency I entered would also be a to-do list sub-item, if that makes any sense.

Overall, great concept and user-interface. Looking forward to seeing this product progress.