I've researched quite a bit and haven't found the answer, I've searched every package in my computer and none of them were from phpservermon so I couldn't remove it through terminal. The version I have is 3.3.2.
As I understand, Phpservermonitor is a web application. Which means it does not install in your system. It is installed in your web server root directory. If you want to completely remove it. Just delete the phpservermon folder from your www root directory.