@Justin, thanks a lot for your honest review of our plugin! Your suggestions are highly appreciated and we already started to fix some issues you mentioned.

I have just updated the plugin and removed the footer credit that appears on the front-end in the free version. This is now something optional, and if someone wants to show their support to our plugin, they can easily enable it. For everyone else, including existing and new users, the credit will no longer appear by default and will also disappear once everyone will update the plugin to the latest version.

For many users, this wasn't a big problem, and we helped them to hide the credit via CSS, so it wasn't in our intention to force people to upgrade to the PRO version just to remove it. The footer credit helped us to promote the plugin at the beginning, but currently, I believe that's no longer necessary.

We'll try to improve the user experience in future updates, but I think that some issues can't be fixed due to some limitations from different Gutenberg components. For example, the issue with not being able to hit the Enter key to add a new item can be also found in the Yoast's blocks as well (FAQ, How-to).