Yes, this is desktop-only so far. Sorry.

I even removed the mobile-friendly responsive design I had for the landing page to not imply it will work on mobile...

But it shouldn't be a big issue to get the drag&drop working. Trello does it great already. I might have to rethink the hover-reveal icons, though.

As @Tommi mentioned, hover isn't a great concept in general, as UI elements are hidden and user has to discover them. Though, this is less of an issue in an app the user will be constantly using.

Otherwise, excited to see this unfold!

Hover as a concept doesn't work that well in the desktop either.