Tossing out some suggestions:

Instead of: Traditional word processors are for formatting text. Lunette organizes your ideas and supports the writing process.

Try something more like:

Lunette: A Word Processor for writers. A space for ideation and composition, not just text formatting.

Write a bio for each of you. Do not link to your twitter profile and her..whatever that page is. Neither of them says "We are writers with experience writing." Neither of them sells the idea that you know what you are doing with this app.

For your About page, you should put the stuff about "husband and wife team ..." at the bottom. Lead with info about the app, not about the team.

Rewrite your last paragraph in your comment here to strip out all the personal stuff and make it more objective:

Writers come up with ideas spontaneously and usually just type up those ideas at random places in the document, which makes a mess of everything. The MVP seeks to solve that problem, but the broader goal is to continue to develop the app around the writer's use-case and make wrangling concepts into prose an easier process.

Then follow with some of the info found in your second paragraph above (minus attacks on other products -- and I suggest you drop talk of "constantly changing business models" because if this succeeds, you will face similar challenges):

If you find yourself bouncing around from app to app looking for something that feels good and like a place you can really be productive and creative but never find anything that feels quite right, try Lunette.

Lunette is a marriage of writing-process focused functionality and clean aesthetics. Writing is a process. Making notes is just one of many things you might do in an app and there are things that happen while writing prose that could be augmented if the app were specifically designed around that use-case.

Then at the bottom close with something about the team. I would probably leave out the fact that you are "husband and wife." I would position it more like "Stephen Corwin and Kristi Grassi are both writers frustrated with their inability to find an app with the features they need." and the names should, again, link to a bio on the site that highlights why you two are qualified to make this app and make it better than other writing apps.

You also need some explanation for the screenshot on your landing page. The screenshot does not tell me what it does. I have to guess and those guesses are somewhat informed by your above comment but not by anything actually on the site itself.

If it were me, I would likely take the screenshot, stick it in an editor and circle stuff in red or whatever and then add notes below it: "The section in the red oval on the right is blah blah blah."

Tell me what it does and why this helps me write.