I think it would be huge if you would add a small video or gif to the homepage. I'm having a hard time understanding how the UI works by looking at the screenshot and I find that is critical to me making a decision for a note taking app.
We have some different graphics in our Slack App Directory description: https://slack.com/apps/A0G9XHRE0-memo-notes-at-work - do you find these more helpful?
It seems like there is a lot of interplay between participants too and I'd like to see how that works.
Just some cents on my initial reaction to seeing the product. Kudos though!