Looking through the rendered source somewhat confirms this, and puts together a darker picture of sloppy, jQuery riddled javascript flung into whatever context it was needed.
I don't know how this is much better than asana (which is totally free, and quite performant) or tools like Firetask, Things, or any other myriad GTD tools. It's simply slower than those, and that's unfortunate.
Congrats on shipping something. Please take the time to polish it up as your immediate next step.
edit: Yikes. Wordpress isn't as secure as you think it is. things like this:
https://jottlyapp.com/wp-admin/post.php?action=delete&po...
as a direct action within your application isn't such a great idea.