I agree - the attribution needs to be removed for paying customers, or at least for me to want to pay for it to use with a client.
The phrasing should be customizable. Even better if the bug is an SVG and I can paste in my own SVG for the bug icon.
I was worried about how it worked on mobile, and unfortunately on my iPhone I could not find a way to drop the bug where I wanted. It did show a popup eventually but it covers a lot of the page given it doesn't work as expected.
Just sharing thoughts/observations; I really like the concept as well.