Windows gave me a firewall notification when I tried to play singleplayer. I've never made a multiplayer game, so I don't really know if that's normal or not, but it just seems odd to me. I also noticed that if I blocked it through the firewall, the game simply softlocked and I had to Alt+F4 and restart in order to try again. I feel like if there's something preventing the game from continuing, there should be some sort of notification and option to retry or exit.