Seems to be a well designed plugin, but it has some features that needs to be fixed. I currently use Defender free plugin for my medium size business website.
I had high hopes with this plugin, when I activate hide WP admin login page. I cannot log out. But any other security plugin I don't have this issue, I tested it and WP security ninja won't let me log out.
I checked it, and your plug in has an error with this. It sends me to a page cannot be found page, my wp dash is still there. Basically I cannot log out of my own website when I active it.
Please get this fixed, I might have to return the product.