Some Windows users have reported encountering a pop-up notice about network activity and security.

This game uses OSC (http://www.opensoundcontrol.org), which is a well-known standard for communications between different programs. It opens 2 ports - one for sending, one for receiving. These are not connections to the internet or outside world - they are on "localhost," which is another way of saying they are confined to your local machine. This is how the game is able to talk with other programs (including other games), and it poses no security hazard. 

If you have further questions, feel free to visit the forums at
http://www.paperkettle.com/community

Thanks!
Chris