Your program has an import/export feature -that’s a flimsy excuse for leaving things behind after uninstall. A wordpress plugin should uninstall completely, leaving a person’s wordpress installation just as it was before the plugin was installed. Imagine if every plugin we tried left garbage behind, we’d be left with a giant mess.
And I didn’t see the PRO features highlighted in any way when I installed the plugin. I’m just glad I noticed before investing a few hours into the plugin -only to find that a feature I needed had to be paid for.
In any case, this is just my review of your plugin -take it for what it is.
