Two things you can do. First, right-click the game and attempt to run it as administrator. If that doesn't work, open your start menu and search 'Windows Firewall'. Click the result with the same name that'll show, and in this dialog click 'Allow a program or feature through Windows Firewall', located on the top left. Is the box for FeralHeart unchecked? Check it. If it isn't there, click 'Allow another program', and look for FeralHeart.exe, found in C:\FeralHeart. This fixed a similar issue for me when I started playing.