First thing I noticed, hovering the big "Get started" button did not change my mouse cursor to a link-pointer. Just a small suggestion :).

Edit: Also, after clicking on "Get Started", the first field (email) should be in focus so the user can start typing, without having to move their mouse and click it first.

Edit 2: I love the simplicity of this tool. The interface is pretty good (but not yet great). How can I contact you?