I like the 'how it works' diagram that we put right on the front page @ https://Userify.com... (ssh key manager, new version dropping next week). More companies should tell how it works right up front like that even if it's ugly.
I really like the colors, simplicity, clean feel and clear communication.
I'd say it feels a little like a mobile-on-desktop kind of thing. Did you maybe do mobile-first and not follow through completely? A side-by-side graphic and/or intro with a CTA might feel more natural on the desktop.
Putting the graphic alongside what you have now might even be enough to make it feel right; something like this (I'm not a designer!): http://i.imgur.com/HJMrEsU.png
Yep, you guessed it -- it's kind of a mobile-on-desktop bootstrap sort of thing. (The app itself is responsive as well, even moves the toolbar to bottom of screen.)
I think the side-by-side graphic and intro w/ CTA is a great idea. It could even separate into a single column on mobile. and huge thanks for taking the time!! (it's an awesome idea. are you sure you're not a designer?!)